Trivia: During filming, the relationship between Alec Guinness and David Lean deteriorated. The final straw came for Guinness when he realised that a large chunk of his scenes had been left on the cutting floor by Lean. After filming was complete, the two never met or spoke to each other again.
Trivia: The first role for Daphne Zuniga.
Trivia: The Grand National sequence towards the end of the film combines filmed footage with real footage of the 1983 Grand National.
Trivia: Actress Sally Field is yet remembered and sometimes mocked for her 1985 Academy Award speech that included the gushing line: "You like me! You really like me!" Problem is, that's a misquote, she didn't say that line. When accepting the Best Actress Oscar for "Places in the Heart," Sally Field actually said: "I can't deny the fact that you like me. Right now, you like me." So why does everyone remember the misquote? It's because Jim Carrey satirized Sally Field's award speech for his 1994 movie, "The Mask," in which he originated the misquote: "You like me! You really like me!"
Trivia: In the opening scenes Paul Reuben, driving a camp bus, is passed by a motorized "wheelchair." This was the world's first "Personal Mobility Vehicle", invented in 1959, named the "Ramble Seat." This prop has never been seen again, despite the family looking for decades.
Trivia: In one of his weekly strips, Stephan Notley's "Bob The Angry Flower" facilitates the reconciliation of C.H.U.D. and humans.
Trivia: Scream Queen Linnea Quigley appears in the movie as a babysitter.
Suggested correction: How is someone being in the cast a piece of trivia? Unless it's something notable like one of an actor's earliest roles, or a final appearance, it's not really interesting enough to be considered trivia.
Trivia: When Kelly Lebrock is on the subway grate getting her dress blown up, it's a nod to Marilyn Monroe's movie " The Seven Year Itch."
Trivia: The domed city seen in a few shots is the same model city used in Logan's Run.
Trivia: The scenes of Billy and Christie gawking at the final battle between the two ninjas were filmed months after principal photography. Lucinda Dickey is wearing a wig because she had already cut her hair short for her role in Breakin'.
Trivia: Ralph Richardson, who played the Sixth Earl of Greystoke, died shortly after filming had ended, and he received a posthumous Academy Award nomination for Best Supporting Actor. The film was dedicated to his memory.