Back to the Future: Part II Movie Poster

Goofs from Back to the Future: Part II

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  • When the DeLorean is landing in the alley in 2015 it is raining, but a camera angle shows the main street at the end of the alley and the cars going by are in the sunshine.
  • When Marty is watching his other self talking to his parents, Biff's shadow can be seen on the wall. He is waiting for his cue.
  • At the beginning of the film, as the Doc departs the McFly house with Marty and Jennifer, the camera is briefly reflected in the rear futuristic shiny license plate.
  • When Doc opens up his case of "emergency cash", a tripod is briefly reflected in the money cases.
  • When Marty confronts Biff about the Sports Almanac; Biff pulls a revolver and points it at Marty. There are no bullets in the gun; otherwise, the tips of the bullets would be visible in the cylinder. There are blanks in the gun which are shorter and not visible.
  • When Biff starts in on Marty with "You think that stupid disguise is gonna get past me?" he challenges Marty to a fight and Marty says, "No, Thanks," and turns to exit the shot. The edge of the window in the background is the split. When Marty turns, the brim of his hat just barely crosses the line, causing it to disappear for a few frames.
  • When they first arrive in 2015, Doc says "Here's our exit" and turns the wheel to the left. Then in the next shot the car turns right.
  • In all the scenes of Young Biff and Old Biff riding in the car together, the car has no rear view mirror on the windshield. When Young Biff first comes back out and gets into the car again ("I'm going to the dance, Grandma"), it still has no rear view mirror, yet after he backs out onto the street and it then cuts back to the shot looking in toward the windshield, a mirror is present.
  • When Lorraine is pushed by Biff in the casino you can briefly see the padding on her leg to protect her during the fall.
  • Marty is able to cross the café instantly as the camera cuts (just before saying "I'll show you")
  • When the police put 1985 Jennifer in her 2015 house it was dark outside when they opened the door. However, when the camera was facing Jennifer on the couch, you can see that the shoot was filmed in the day by looking at the window behind Jennifer. Then after Lorraine pulls up the scenery screen in the next scene it's dark again.
  • As Griff's thugs are about to crash into the clock tower, you can clearly see the reflection of the huge wiring harness holding them up.
  • Just after Marty's confrontation with alternate 1985 Biff, during the sequence in the DeLorean a camera rig can be seen behind Marty through the misty window.
  • When Old-Biff gives Young-Biff the sports almanac in the car, the two halves of the frame jitter independently of each other.
  • In the end of Back to the Future (1985), when Marty and Jennifer are interrupted by Doc, Marty is not wearing a wristwatch. But when the scene was re-shot for the opening of Back to the Future Part II (1989), Marty is wearing a wristwatch. Also, Marty and Jennifer have switched places --- at the end of BTTF1, Marty had sat in the middle and Jennifer on the outside --- but of course this change in their seating-positions was necessary so that Dioc could reach Jennifer easily to put her to sleep with the alpha rhythm generator.
  • When Marty jumps into the water and Griff and his gang fly into the courthouse, the crew (looks like a crane camera) is reflected in the door that Griff smashes through.
  • When the Delorean lands in the alley in 2015, the wheel nuts are different than in all other shots of the car and the black DMC logo on the wheels is missing.
  • As young Biff is chasing Marty through the tunnel after Marty gets the almanac back, Marty pushes off with his right foot with his left foot on the back of the board (riding goofy). Later, as an upper body shot of him is shown, Marty is facing the other direction, with his left foot on the front of the board (riding regular).
  • Biff's car in 1955 changes back and forth from a 1946 Ford to a 1947 Ford, as can be seen by the differences in the parking lamps and the shape of the vent windows.
  • Marty's distance from the end of tunnel varies back and forth as he travels through it.
  • When Marty is hanging onto the rope of the jeep while being chased by Biff's gang, he hits the windshield of the car and goes flying toward the lake and the rope completely disappears between shots.
  • When you see the DeLorean landing in Hill Dale (2015) you can see that the shot obviously changes from the shot of the model to the 'real' car. The cooling vents on the back of the model car are clearly darker and smaller than on the actual Delorean, they don't cover the tail lights at all.
  • When the DeLorean is hovering behind Biff's car before entering the tunnel, as Marty is getting out of the car onto the hover board, a brief view of the time circuits shows yellow displays on top, green in the middle, and red on the bottom. The red display (destination time) should be on top, and the yellow display (last time departed) should be on the bottom. This same shot also reveals that the driver of the DeLorean is not Doc, but a stuntman who is clearly trying to obscure his face from the camera.
  • When Marty and Doc talk about going back to 1955, whenever the camera is focused on Marty, you can see what looks like some sort of mechanical device or someone using the equipment outside of the window. This can be seen between 01:01:56 and 01:01:57 and also 01:02:03 and 01:02:06
  • Doc has a watch on both wrists. The one on his left hand alternates from dial-in to dial-out throughout the film. Most noticeable right at the beginning when they are arriving in 2015. It is inside his wrist as they arrive but outside when he get out of the Delorean.
  • As Doc and Marty are about to travel back to 1955, Marty says, "What about Jennifer? What about Einstein? We can't just leave them here." When he says this, the shadow of the boom operator and boom microphone can briefly be seen above him and on his t-shirt.
  • When the Doc is hovering behind Biff's car in 1955 allowing Marty to catch up, the wheels that the car is really driving on are visible.
  • The cooling vents on the back of the DeLorean change between silver and black throughout the film. A clear example of this is the first landing scene of the DeLorean in the alley in 2015.
  • When Marty arrives in the alternate 1985 and sneaks into the house he thinks is his own, a Dirty Dancing (1987) (1987) poster can be seen on the girl's bedroom wall. If history was changed, Dirty Dancing could have been released in an earlier year, but Biff only changed the history of Hill Valley, not anywhere else. So if only Hill Valley is different, everywhere else would've been the same. The secondary headline in the "Emmet Brown Committed" newspaper which read "Nixon to seek Fifth Term" wouldn't have worked either as Biff didn't get himself into politics, and even if he did he wouldn't be able to make changes in the Constitution.
  • When Marty does the "switcheroo" in the hotel stairwell to avoid rich Biff's thugs, a crewmember's shadow is visible at the spot Marty jumps to. This can be seen right before the camera pans upwards to reveal Marty a few flights up running towards the roof.
  • When Mr. Strickland and Marty are talking on Strickland's front porch in the alternate 1985, Strickland can be seen mouthing several of Marty's lines.
  • In one future scene where Griff and his thugs are chasing Marty on the hoverboard, the wires suspending them above the ground are clearly visible.
  • After Old Biff steals the DeLorean, he backs it up into a dumpster and several trash bags. The dumpster and the bags move before the DeLorean touches it.
  • When Doc, Marty, and the unconscious Jennifer are landing the DeLorean in the alley in 2015, the wires suspending it from its corners are clearly visible.
  • While Marty is being chased through the tunnel by young Biff, Marty's stance on the hoverboard is left foot forward or regular. A split second later the stance is right foot forward or goofy pushing mongo (Front foot pushing). A second later the stance is regular again then it switches back to goofy pushing mongo. Then in a quick shot it's regular again. And at the beginning of the movie his stance is regular.
  • Reflected in Biff's car hubcap as he gets ready to chase Marty inside the tunnel.
  • When Doc says, "Griff's going to ask you about tonight," he actually says "Biff" accidentally.
  • When Marty walks out of the alley (where the DeLorean first lands in 2015) we see a dark blue car with a white stripe taking off. In the next shot of the same runway, there's a light blue car taking off.
  • When Marty and Doc are getting ready to go back to 1955 to get the sports almanac, Doc makes a point of turning the time circuits on. However, they were already on, which is evidenced right before this when they are shown to be malfunctioning.
  • When Biff hits Lorraine to the floor in their hotel, her shoes are on. In the next shot, they're off. In the next shot, they're on again.
  • When Strickland and Marty are talking to each other in the alternate 1985, there are cracks in the sills around the window and the front door. When the car full of armed "slackers" starts shooting at them, the cracks in the sills disappear.
  • The almanac is constantly folded up and put into the pockets of McFly and Biff; however many times the almanac is shown flat with no creases on it.
  • When Biff is unconscious, Marty kneels next to him, unzips Biff's jacket, and is seen reaching in for the Almanac. In the next shot Biff's jacket is zipped again and Marty's knees are above Biff's chest.
  • When Marty is on the hoverboard nearing Biff on Biff's side of the car, one shot shows Marty very close to Biff, and in the next shot, he is at the back of the car.
  • When Marty is sneaking into Strickland's office, the US and California flags are next to each other, away from the stack of books on the desk. In the next shot, when Marty reaches to move the US flag, the California flag has already been moved next to the books.
  • When Marty is on the hoverboard escaping from Griff, he holds on to the back of a surf truck, and his grip keeps changing just before he swerves onto the water.
  • Just as Doc drives up behind Biff (just before they enter the tunnel), the Doc turns the wheel of the Delorean off to the left and also turns his head in that direction but the exterior shot shows the car going right.
  • In the opening scene in which Doc arrives at Marty's house, the time on his wristwatch is actually different from what it was in the identical scene that closes off Back to the Future (1985).
  • When the DeLorean is following behind Biff's car and Marty is climbing along the side of the DeLorean towards Biff, a wheel used to roll the "hovering" DeLorean along the ground is visible underneath the front right tire.
  • When Doc and Marty are driving on the Sky Way, Doc says "damn this traffic," but in the reflection of the DeLorean's front window there are no cars.
  • When Griff drops his pit bull board a blue stand is visible as he steps onto the board.
  • In the tunnel scene, as Biff is preparing to chase Marty, the car's front tag is dated 1951. California-registered cars had 1951-dated license plates in 1955; a small metal "55" tab was placed over the "51" stamped into the plate to keep the registration current.
  • In the ally way in 2015 when Marty is putting on the jacket Jeniffer's arm is laying on something blue. But when Doc Brown presses the size adjustment button on Marty's jacket, Jeniffer's arm is now resting on something beige.
  • In the re-shoot of the opening sequence, the tools hanging on the interior garage wall are different than the tools from the same sequence at the end of Back to the Future (1985).
  • When Old Biff says "Something very familiar about all this" there appears to be a crew member reflected in the window. But it's not a crew member, it's just a guy on the sidewalk.
  • Just after the DeLorean lands in the alley, Doc opens the door and his robe/coat is already wet before he sticks his leg out.
  • The miniature Deloreans used in effects shots have no key locks on their doors, making it easy to determine whether a model or the actual vehicle is being used in a scene. This is especially true in shots where the car is touching down, and split screens are used to mask the transition from model to full-size vehicle.
  • During the tunnel chase, where Biff tries to run Marty down, his foot is shown not in the strap on the hoverboard. But when Marty is rescued by Doc, his foot would have to be in the strap in order not to leave it behind.
  • The DeLorean that lands in the alley in 2015 has smaller cooling vents, thrusters for hover mode. They do not overlap the tail lights of the car like they are shown to everyplace else in the movies. It also appears to be smaller in every dimension.
  • When Marty is being chased by 1955 Biff in the tunnel, in the wide-high shot, Marty is actually riding a skateboard, not the hoverboard.
  • When Doc holds up the news paper showing the article about Marty Jr. getting arrested, underneath it is an article about how cholesterol could be the cure to cancer. However, both articles talk about Marty Jr. stating "Protesting that he was "put up to the whole thing" by a local gang, Martian McFly Junior (17) was arrested today...". Then, the article reappears in the newspaper about Griff. In addition, at the bottom of the paper, it says "Coming: McFly insists that the gang..." on both copies.
  • In the opening scene the background vehicles change in several ways. The VW Bus changes position and color first green then tan. It also goes from next door to two houses down. The Chevrolet Suburban across the street changes from the original mid '60's era to a early '70's model. Its position also changes slightly.
  • When, in 2015, Marty presses the drying mode on his jacket, the jacket tells him "your jacket is now dry" when it is clearly still wet. He's not wearing an actual dry jacket until the next scene when he goes to give the girl her hoverboard back.
  • When Biff gets his car back after manure clean-up in 1955, the detailer's truck has a tail light from a GM van from the 80s.
  • When Marty is at the graveyard, the flashlight changes hands between shots.
  • As the DeLorean is landing in the ally in 2015 - when the tires rotate down - you can see the mechanical arm lowering the vehicle.
  • As Marty is crawling across the electrics position above the stage at the enchantment under sea dance in 1955 you can see a few lighting fixtures hanging there in the background. You can see a Altman 360q Axial Ellipsoidal Reflector Spotlight which wasn't introduced until around 1971.
  • When Doc comments on how great the weather service is, he looks up at the sun past the buildings, yet the side of the building facing Doc (away from the Sun) is lit by sunlight.
  • When the first Marty (from Back to the Future (1985)) is waving to George McFly while playing "Earth Angel", you can still hear the electric guitar, even though he isn't playing it.
  • As Biff and the two ladies in the hot tub were watching A Fistful of Dollars (1964), scenes are shown out of order.
  • Marty jumps into water after his hover board quits, but in the next scene he is walking up some stairs.
  • Biff's preferred porn is called "Oh La La" magazine, Marty pronounces the magazine as "Ooh La La," a common American mistake.
  • When Doc and Marty return to 1955 and land behind the Lyon Estates billboard, Doc opens the trunk which is covered in fresh ice, but it doesn't appear to hurt his hand as it did in Back to the Future (1985) after sending Einstein one minute in to the future.
  • When Marty sees George deck Biff, we see the Marty from Back to the Future (1985) running out to the parking lot. When he glances at the photo and splits, the couple he runs in to are completely different to the actors in the first movie and they don't say anything to each other, whereas they should have been seen to say 'Who is that guy?' 'That's George McFly.' 'THAT'S George McFly?' as they did in the first movie before Marty bumps in to them. Furthermore, when Lorraine is picked up off the floor by George, we see his hair is shaved very close at the back and sides, but in the next shot the new actor playing George who leads Lorraine away doesn't have closely shaved hair.
  • Marty's Japanese boss in 2015 is called "Fujitsu-san". Fujitsu is not a real Japanese last name, but the contraction of "Fuji Tsushinki" (Fuji Telecommunications), "Fuji" being likewise the union of the first syllables of "Furukawa" and "Siemens" ("Si" is pronounced "Ji" in Japanese"). It is very unlikely that a Japanese person bears that name, which is actually a trademark. The gag is that trademarks and commercialism have gotten out of hand in the "future."
  • In 2015, when Marty's mom, Lorraine hydrates pizza, she pulls in out of the hydrator and the pizza is uncut. In the following shot when she brings it to the table, the pizza is suddenly cut.
  • After the hover board scene when Griff and his gang are being pulled out of the courthouse and Griff says "I've been framed" you can see the wires holding the camera that takes the picture, if this was supposed to be hovering then it wouldn't need wires to support it.
  • After the DeLorean first lands in the alley in 2015 and the camera pans around the car, Marty opens the passenger door and the door mirror is folded back. However it was not folded back when they departed from in front of his house in 1985, nor is it folded back later in the movie.
  • At the dance, the original 1955 Marty (the one playing the guitar) doesn't say "Try and" (like he did in part I) before saying "keep up" to the band. Also Marvin Barry goes to the audience's left to make the phone call to Barry (not behind the blue tinsel curtain either), while in the original, he either was off to the right or off to the left and behind the tinsel curtain (based on the placement of the curtain on the left that is seen in part I).
  • While both the Destination Time and the Present Time say "OCT 21 2015 04:" in the beginning of the film, only the Present Time says it's in the "PM".
  • When Griff is taunting Marty in Café 80s, behind Marty outside the window, there are two men talking to each other (standing next to a red X). After Marty ducks to avoid being hit by Griff's bat, the men have disappeared,
  • Assuming time travel was possible as described in the movie, you couldn't travel into the future and see your older self. As you skipped the intervening period by time traveling, your older self would not exist in that time line. This would be possible as long as you returned from the trip. If they could not have returned, I.E. If Marty died in the future, then it would not have been possible.
  • In Back to the Future part 1 when Marty Mcfly was playing "Johnny B. Goode" and when Marvin Berry made the phone call to his cousin, the phone had a straight wire. But in the Back to the Future part 2 the phone had a curly wire.
  • In addition to the size of the two seat DeLorean, plus the time travel equipment, there would be no way for Doc, Marty, Jennifer and Einstein to all fit in the car when they're going back to 1985.
  • When Marty, Jennifer and the Doc first arrive in the future it's raining. Despite traveling at 88 mph or above, the rain on the passenger windows of the DeLorean runs vertically down. Air velocity at that speed would push rain back faster than gravity would pull it down.
  • There is no way fifty years worth of horse races, MLB games, NBA games, NHL games, NFL games, (as well as every other game mentioned) would fit into a book the thickness of the almanac used in the film.
  • While in Alternate 1985, Doc Brown shows Marty the Newspaper which features Doc getting committed to a mental asylum, and one of the other articles on that same paper reads "Nixon Seeks Fifth Term in Office". The alternate time line was created when Old Biff traveled back from 2015 to 1955 to give Young Biff the sports almanac and from the events which stemmed from it. This means that, for all intents and purposes, that prior to November 12th 1955, there was no alternate time line, and all the historical events leading up to that date remained the same. This being said, there was no way Nixon could've sought a fifth presidential term in either time line, as the Twenty-Second Amendment (which limits any US President to seek no more than two full terms in office) was passed by Congress in 1947 and ratified by the states in 1951. Unless Biff's historical-meddling had managed to screw up the time line so much so that it would affect the US Government of all things (which is very unlikely), then even in Alternate 1955 onward, the two-term presidential limit would've still been in place, and even if Nixon had not resigned his presidency in the Alternate time line and served his two full terms in office, his presidency would have ended in 1977 and he would not have been able to seek reelection for a third term much less a fifth.
  • When old Biff and young Biff are driving to young Biffs house the car gets scratched on the drivers side, yet when they drive into the garage young Biff is checking the scratch on the passenger side.
  • When Biff and Marty watch A Fistful of Dollars (1964) on TV in 1985A, Joe (Clint Eastwood) is first shown wearing his hat, but when Ramon (Gian Maria Volontè) shoots at him, the hat is missing. This is due to editing - the shot of Joe wearing his hat is from an earlier scene in the film.
  • In the alternate 1985, Biff corners Marty on the roof of the casino. Throughout the whole scene there are curved lines around the corners of old Biffs mouth where the latex prosthetic skin appears to begin separating from the actors cheeks as he is delivering his lines. It's especially evident when he says the line "Besides,they couldn't match up the bullet that killed your old man."
  • Biff's Ford roadster is clearly fitted with sun visors, yet in the closeup shots of the two Biffs sitting in the Tannen driveway and talking about the almanac, no visors are present.
  • The audience assumes that Biff's gun is a standard six-shooter like in all the old Westerns, but in fact, Biff's revolver is a Smith & Wesson Model 60, which has a five-round cylinder. Biff clumsily blasts away at Marty five times while chasing him through the mansion, so there is no way he could have gotten off another shot when confronting Marty on the roof ("Jump off the roof, or you'll die of lead poisoning!") without reloading. But because Biff's gang was chasing Marty to eventually the fire exit stairs, Biff himself could've gotten some bullets to reload his gun.
  • When the DeLorean lands in the alley in 2015 with the tires folding up, it comes to a final rest with the front tires sticking out slightly past the front fenders. In the next shot from the front of the car, the tires are tucked up under the fenders as they are throughout the rest of the first and second films when shown driving on the ground.
  • When old Biff steals the time machine to change the past, he returns the Delorean back to 2015 so Doc and Marty would suspect nothing. He should instead have arrived in the alternate version of 2015 just like Marty and Doc went to the alternate 1985. No explanation is given as to why he can return to the unaltered time-line while Doc and Marty can only get to alternate versions of the time-line.
  • Right after Doc, Marty and Jennifer have arrived in 2015 and Doc takes off his mask, some residue from the mask is stuck on both sides of Doc's nose. In the next cut, as Doc starts running, the residue has inexplicably disappeared.
  • When Marty retrieved the sports almanac from the garbage can in Strickland's office, it was the almanac cover wrapped around a girlie magazine. However later when Marty grabbed the almanac from the unconscious Biff, the almanac was intact with the original cover.
  • The license plate on Marty's truck (in the garage) is different in the re-shoot of the scene at the beginning of the movie. In the original the plate reads "2EYP916" (or similar, it's hard to read exactly but it does end with 916). The plate in BTTF2 reads "2BAK860".
  • After Doc and Marty bring the unconscious Jennifer back to her house and leave her on the porch of her home, the next shot shows the twin Lyon Estates "concrete" walls at the entrance of Marty's street. No city anywhere would allow private builders to construct a "sign" like those on city property, (anything from the beginning of the sidewalk to the street) but especially NOT on the actual street which would be a driving hazard.
  • When Marty is talking to the alternate 1985 Biff, Biff pulls a lock box out of the wall safe and opens it. He pulls out the Almanac to show Marty and Marty reaches out to take it before Biff pulls it away. Marty was clearly trying to take the book away from Biff, but there is no real reason for him to do so because taking the book back then would not alter the timeline back to the original 1985.
  • While the events the film outlines in 2015 cannot be considered errors for obvious reasons of fiction and fantasy, the notion that Chicago and a new team in "Miami" could have ever met in the World Series IS a mistake for a simple reason: even in 1989 when the then Florida, now Miami Marlins were in the planning stages, Major League Baseball had made it clear that its planned next round of expansion (to take place in the early 1990's, which ended up actually being 1993) would permanently put both new teams in the National League. The reason for this is that the American League at the time had two more teams than the NL and the league wanted the leagues to have the same number of teams. While it would take a long time and many other moves to fully realign the two leagues (including the change from four to six divisions with a wild card game, an expansion AL team in Tampa Bay, Milwaukee moving from the AL to the NL and Houston doing the opposite), neither the Marlins nor Cubs were ever considered for an NL-AL move. That makes the idea behind this scene a mistake in any context.
  • When arriving in 1955 at the Lyon Estates sign, the flux bands on the flying DeLorean are lit up blue on the flying model and remain on until we see the car landing behind the sign. They are only supposed to light up when hitting 88 miles per hour. They are never lit up after entering and exiting the wormhole.
  • When they travel back in time from 2015 to 1985 and the passenger airplane flies by, there would not be readily-visible brightly-glowing engine-flames unless the plane had afterburners. Only military jets have them; civilian jets have all of their combustion-chambers "deeper" (farther back inside) within the engines.
  • Old Lorraine pics up the hydrated pizza dish with her bare hands. That pan is metal, so it should still have heated up.
  • Some viewers assume that when the police take Jennifer home and they tell her "to be careful in the future". This implies that they either know that Jennifer is from the past or a time traveler and that they wouldn't be "in the future" at least from the police officers point of view, but rather in the present. They don't have such knowledge, implied or otherwise, they're obviously referring to the future of 2015 Jennifer, although it might also be a play on words by the writers.
  • Doc doesn't interfere with the police officers picking up Jennifer, saying that the officer wouldn't believe that he and Marty were time travelers. However, these same officers accepted without question that Jennifer was her older self, despite her youthful appearance, because of her thumbprint. Marty's thumbprint also would not have changed, so he could easily prove to the officers that he is his older self, Jennifer's husband.
  • In the alternate 1985, Marty's former neighborhood is now a high-minority neighborhood with frequent murders, as evidenced by the chalk-outlines in the street. Despite this danger, the daughter in the family that lives in his old house sleeps with the window open.
  • At the dance, at the end of Earth Angel in Part 1, Lorraine and George weren't kissing, just looking at each other. In Part 2, Marty sees them at that point, kissing.
  • When Doc and Marty arrive in the alternate 1985. (unbeknownst to them) they leave Jennifer on a porch with the idea that she would just wake up at her house. Later on its revealed that they are in a very dangerous neighborhood where nobody in their right mind would be in such a vulnerable position. She was left there for hours and her whereabouts are never addressed and she is never even seen again.
  • At the dance when 1985 Marty is looking on at Lorraine and George thanking 1955 Marty, Lorraine calls him Marty instead of Calvin.
  • When old Biff returns to 2015 after giving 1955 Biff the Almanac, he should have returned to an alternate future where Biff was rich not the same 2015 he left earlier. This is explained to Marty by Doc later when Marty questions whether they can go to 2015 again to stop old Biff from getting the almanac.
  • The jet plane that skims the DeLorean's roof drops noticeably to be more in view after it first appears through the car's windshield --- obviously just a model-plane suspended on wires.
  • The 50-year Almanac has only a few dozen pages, and so the sports stats for 1955 would be listed just a few pages in from the front cover, yet Old Biff opens the book to a random spot that's clearly much nearer the middle of the book.
  • Marty does not answer phone, yet Mr. Futisu shows up on the screen, nor does it say thank you for using AT&T at the end of the call.
  • At the beginning of the movie, Doc assures Marty, "you and Jennifer turn out fine". Marty and Jennifer were far from fine in 2015: Marty lost everything and married Jennifer in Vegas, and even Biff comments to Marty (thinking that he is Marty Jr.) that Marty Sr. "flushed his life down the toilet".
  • When Biff confronts his old self in his car in the street after chasing the girls and shouting "I'm going to marry you one day", Biff is wearing Levi 501 jeans with the red tab on the right rear pocket. Old Biff then drives young Biff to his house and old Biff stuffs the Almanac into young Biff's right rear jeans pocket - which no longer has the red Levi tab.
  • Strictly logically speaking, there is no reason for the company logo on Biff's matchbook from 1985 to change while it is in 1955 (or ever, for that matter). In this instance, the movie treats the future as if it were the past by allowing future events to cause a change in the past. The matchbook is in 1955 at this point. 1985 hasn't happened yet. Logically, in 1955 the matchbook would be a curious relic without an origin.
  • There are three door lights on each door on a DeLorean car. The front and side view are orange and the rear light is supposed to be red. On the 'B' car the lights were put back incorrectly at some point. In several scenes, including when Doc and Marty are hiding the car behind the billboard, you can see the red light on the passenger side door facing forward. It alternates back and forth as they switch between the 'A' car and the 'B' car.
  • When Marty Jr. falls behind the restaurant's counter and bumps the opposite wall containing the entertainment equipment, the entire segmented panel visibly flexes; obviously just a bendable-plastic single-piece prop-panel instead of the actual cabinet-panels of the various electronic modules.
  • Biff scrapes his car against the side of the tunnel, yet a moment later when he skids around just before colliding with the manure truck, the passenger's side of the car is pristine.
  • Despite Marty and Doc arriving in "future" Hill valley on October 22, 2015, there are no Halloween decorations visible anywhere in future Hill Valley.
  • While it is pointed out that the license plate on Biff's car in 1955 has "1951" surrounding "California." can actually have happened in BTTF II., Biff's car in BTTF I, has the exact numbered tag, but it does not have "1951" on it. It can be seen clearly when Marty runs up over the hood, before Biff's car hits the truck of manure, that the plate has no date on it. When Biff revs up his car in the tunnel, it can be seen clearly that the date is there.
  • Doc goes from having a very sensible approach to time travelling in the first film, to an incredibly wreckless approach in the second. He carelessly rushes around in his time machine in broad daylight, crashing into rubbish bins, flying into a busy lane of traffic and narrowly missing an aeroplane. Later he chooses to land the time machine on a school roof. These are very risky decisions which could have had catastrophic outcomes. He has a time machine, and therefore no need to rush around at all. Towards the end of BTTF1. even Marty (the non-scientist) makes a point about having a time machine and therefore has "all the time in the world". Doc could have easily planned this whole thing in secret, without rushing around, nearly killing people and causing multiple people to unnecessarily see a time machine.
  • In BTTF1 Doc tells Marty "no one should know too much about their own future". Yet in the second film, he forces both Marty and Jennifer to travel to 2015 to alter their futures to avoid a chain reaction of events. Completely disregarding the advice he gave to Marty in BTTF1. Furthermore, according to Grandma Lorriaine in 2015, a much worst chain of events was started in 1985 because of the 'automobile accident'. Doc could have easily helped to prevent this without using the time machine. In turn he would have changed their futures forever and probably for the better.
  • Marty attempts to cover-up for mentioning that he was aware of the real story of how Biff's car was damaged in 1955 by claiming that his father told him before his death. As his mother, Lorraine, was witness to the entire event as well, it would have been perfectly reasonable for Marty to claim that she was the one who told him about it.
  • No matter whose theory of time travel you use, the entire plot should not have taken place at all, no matter of time-lines catching up slowly or intentions to return to the movie-lines present. Old Biff stole the almanac in 2015 to give to his younger self in 1955. Once 1955 Biff changed his future with the almanac, he changed the history of everyone, including Doc. During the travels to 1985-b Doc shows Marty a newspaper that shows Doc has been committed to an asylum. The date Marty and Doc are at is still the same date or maybe the day after the original events of BTTF part 1 where Doc unveils the time machine for the first time. Now with history changed, Biff has prevented the time machine from even being created, now that Doc is in a psychiatric ward, hence there was no way of travelling to the future now for old Biff to even give the almanac to himself now that the time machine has been stopped from even being invented by Doc in the first place.
  • When young and old Biff are in the garage and old Biff is explaining about the Almanac, young Biff is clearly seen throwing the Almanac into the back seat of the car however old Biff is promptly seen reading from the Almanac with retrieving it from the back seat.
  • When they travel in time and the airplane flies by, you would see flames if the plane had afterburners. Only military jets have them.
  • The Doc comes back from the year 2015 and tells Marty that something has to be done about his kids. The year 2015 hasn't been written yet, so it wouldn't have existed.
  • When Doc and Marty are at the Lyon Estates sign in 1955, the previous DeLeorean never shows up at the Lyon Estates starting line. Since there were multiple DeLeorans through out the film. It too should have shown up. The starting line wasn't at the Lyon Estates billboard. It was at the Blue Bird Motel near town square.
  • The Doc comes back from the future and has an entirely different outfit and somehow got facial rejuvenation surgery. How would he be able to afford it if future money doesn't exist?
  • Jennifer is left unconscious in danger places twice. First, she's left unconscious in an alley. She could have stayed safely in an air-conditioned DeLeoran. And the second time, she's left unconscious on a porch swing in a dangerous neighborhood. After discovering he's in the wrong house, Marty could have went back for her. In the first scenario, Doc didn't want her in the car since he was busy dealing with Marty Jr. In the second scenario, Marty was confused at what was happening. Strangers were living in his house, houses were boarded up, and it was just utter chaos. Also Jennifer was passed out cold. Marty didn't exactly have a way to properly wake her and without transportation there was no way he could have carried her while he was trying to figure out what happened.
  • The Gray's Sports Almanac shows sports statistics from the past. Since Biff constantly wins at sports bets, the rules of the sports games would have been changed. This would make the almanac obsolete. Gambling/betting rules change every so often to prevent people winning consistently and so that the house doesn't go bankrupt from paying out so much.
  • When Marty asks for the Grays Sports Almanac, alternate 1985 Biff shows it to him. After putting it back in the safe, he mentions that his old self told him to keep it a secret. If he was told to keep it a secret, then why did he show it to Marty? He was about to kill Marty, so it didn't matter if he knew or not.
  • George and Marty appear to be working with their high school bullies who are now their supervisors. Just because they went to high school with their bullies, doesn't mean they had to work with them. Let bygones be bygones.
  • While in 2015, Doc explains the consequences of 1985 Jennifer coming face-to-face with her 2015 counterpart... either they pass out from shock or there is a "time paradox" that could destroy the galaxy. Yet, when Old Biff from 2015 sits down and has an entire conversation face-to-face with Young Biff from 1955 - neither of Doc's predictions come true and absolutely nothing happens.
  • In the alternate 1985, after Marty's confrontation with Biff on the roof of the casino, Marty jumps off the roof and lands on the hood of the DeLoren as revealed in the next shot as the DeLorean rises above the roof. Yet, Marty's landing on the hood of the DeLorean, made of stainless steel, makes no noise nor does it seem to leave a visible dent in the hood.
  • In the beginning, in 1985, Doc assures Marty, "you and Jennifer turn out fine". They were far from fine. Marty lost his career as a musician because of the incident with the Rolls Royce, hated his job which he got fired from, Jennifer was disappointed that they got married in the Chapel Of Love. They were clearly miserable.
  • The driver of the Rolls Royce would have been responsible for the accident because Marty Sr. had the right of way. He also would not have grounds to press charges because no crime was committed.
  • Biff using the almanac to win at sporting events between 1955-1985 wouldn't have worked, since him winning would change history along with most or all of the statistics, dates, and games, rendering the book useless after the first few wins (at least).
  • Paperback books like the sports almanac don't come with dust covers.
  • The almanac is quoted as "50 years of sports statistics" but the years covered are 1950-2000 which is 51 years.
  • When Strickland takes the book from Biff and asks him if it's homework, Strickland says "50 years of sports statistics, interesting subject" and is seen flicking through the book. He walks back to his office and eventually throws the book away. When Marty retrieves it from the bin and flicks through it, it's "Ooh La La", the girlie magazine. Strickland would have known that from looking at it in front of Biff. He looks at the cover and makes that comment. After seeing the rest of the book he confiscates it when he realizes what it was.
  • It has been mentioned that when Biff delivers the almanac to his younger self, he should not have been able to return to 2015 without arriving at a variant timeline. But this plot hole goes back even further than that, to the beginning of the film. In the version of 1985 where Doc picks up Marty and Jennifer, once they get in the car and disappear, they no longer exist in the timeline. When they arrive in 2015, it would be a version of 2015 where they got into the DeLorean in 1985 and were not seen again until arriving in the future.
  • When Marty was at the back row seat of the car and with Biff driving in front, Marty could talk to Doc through the walkie-talkie without lowering his voice, and Biff was completely unaware that Marty was there.
  • The DeLorean travels through time, not space per se (for example if it started a trip on Main St in 1955 it ended on Main St in 1985 although it does travel through time in the sense that the Earth's position in the galaxy would differ), however in the beginning they leave 1985 relatively close to the ground yet don't arrive in the same spot in 2015, instead appear to be at a much higher altitude.
  • When the police scan Jennifer's thumb when they pick her up, it brings up her maiden name of Parker. When she gets out of the car she is barely conscious and obviously unable to answer questions, yet when the police leave her in her house, they say "Have a nice day, Mrs. McFly". They would have had no way of knowing her married name.
  • Throughout the entire film, Biff's convertible always has the top down. Predicting the weather goes all the way back to 1861. Therefore, everybody would know that the big storm was coming, nevertheless, Biff continues to drive around with the top down. After he crashes, it starts to rain, now he has a wet car with smelling stuff in it. He should have been prepared.
  • As Marty is tailing Strickland to get the almanac, he passes by Lorraine and his past self parked in the car talking, where she refers to him as Marty instead of Calvin.
  • When Griff pulls Old Biff out of the Cafe' 80's, before he comes back in the diner, he briefly disappears when he's moving between the two doors, since it's the same actor in two different shots.
  • When old Biff gives the Almanac to his young self in 1955, he altered the future, creating a new timeline. So with this change, he could not go back to the original timeline, since it was altered. He should have traveled to the new 2015.
  • Marty attempts to cover-up for mentioning that he was aware of the real story of how Biff's car was damaged in 1955 by claiming that his father told him before his death. As his mother, Lorraine, was witness to the entire event as well, it would have been perfectly reasonable for Marty to claim that she was the one who told him about it.

Spoilers

  • Near the end of the film when Doc instructs Marty to burn the Almanac he 'drops' the hover-board. It can then be clearly seen sitting on a mechanical post - you can see it and it's shadow every time the lightning flashes.
  • Just before 1985 Doc meets 1955 Doc, while 1985 Doc is talking to Marty on the walkie-talkie, the shadow at the base of the lamppost changes as the camera moves around, but it is not 1955 Doc's shadow.
  • At the end of the movie, when Doc and Marty are chasing Biff to retrieve the almanac, and Marty hops out of the DeLorean and on to the hover-board, he straps his left foot into the strap and he is wearing red Nike's. Later when he gets off the hover-board, his right foot is in the strap and his Nikes appear to be blue.
  • When Old Biff hands Young Biff the Almanac, the book passes through the film split (the vertical bar that divides the windshield) perfectly because it was on a motorized rig. But the stand-in for Old Biff didn't hold his arm at the right height, so Old Biff's arm disappears into the bar that runs down the middle of the window while the book floats across to Young Biff.
  • When old Biff and young Biff are discussing the Almanac in young Biff's car in the garage, young Biff tosses the Almanac into the air, landing in old Biff's lap. It is clear that the Almanac, while in the air, is animated not only due to the animation quality, but also that it had no reflection in the hood of the car.
  • When 1985 Doc comes across the Delorean under the canvas in 1955, his hair is clearly styled as 1955 Doc's. It is only in the next scene (in which the two Docs chat) is his hair back to its normal "wild" self.
  • When the DeLorean is hovering and is struck by lightning, it isn't moving 88mph. However, the letter Doc sent from the past explained that "the lightning bolt that hit the DeLorean caused a gigawatt overload which scrambled the time circuits, activated the flux capacitor, and sent me back to 1885," so it's not a plot hole.
  • At the end of the film the original Marty and the Delorean travel from 1955 back to 1985. After the Delorean has leaped back to the future it left twin fire trails on the pavement behind it. As Doc is dancing between the fire trails, it's quite obvious that the filmmakers left some type of flammable padding on the roadway wherever fire is burning, probably to protect the road itself.
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