Trivia: When Billy's mom takes the picture of Gizmo at the beginning, Gizmo becomes frightened and runs over to Mr. Peltzer. When the scene is slowed, you can see the puppeteer's hand underneath while operating the Gizmo doll. Not a mistake as needs slo-mo, but worth a look. (00:19:10)
Trivia: In the opening scene in New York Public Library, the librarian walks down the reading room with her trolley full of books and a man appears and walks across the screen. This man is the film's associate producer, Joe Medjuck. (00:00:55)
Trivia: Not a mistake, just something that's not immediately obvious: When they arrive at the plane after the club scene, the man that walks them to the plane is Dan Aykroyd.
Trivia: John Cusack's real-life sister, Joan Cusack, is wearing a neck brace on the bus at the beginning of the film.