Trivia for The War with Grandpa
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- The second movie Robert De Niro has starred in with the word "Grandpa" in the title.
- Based on the children's book of the same name by Robert Kimmel Smith.
- Robert De Niro and Christopher Walken appeared in The Deer Hunter (1978) and Mistress (1992).
- Uma Thurman and Robert De Niro appeared in Mad Dog and Glory (1993).
- Christopher Walken and Uma Thurman appeared in Pulp Fiction (1994).
- Christopher Walken and Jane Seymour appeared in Wedding Crashers (2005).
- The movie had several failed release dates including April 21, 2017, October 20, 2017 and February 23, 2018.
- Oakes Fegley (Peter) was Pete in Pete's Dragon