Plot hole: When cousin Eddie kidnaps Mr. Shirley, Shirley's wife immediately calls the police. She describes Eddie as 'brutish and huge' or something similar, and wearing a 'blue leisure suit'. She also mentions that she got the license plate number of the vehicle. But how did the SWAT Team know to go to the Griswold's house to find Mr. Shirley? Eddie's RV is not registered in the Griswold's name so the plate numbers would not be much help in finding the culprit.
National Lampoon's Christmas Vacation (1989)
1 plot hole
Directed by: Jeremiah S. Chechik
Starring: Chevy Chase, Juliette Lewis, Diane Ladd, Beverly D'Angelo, John Randolph, Johnny Galecki
Revealing mistake: After Clark cuts the rope on the large tree, it spreads out and branches start breaking windows. One of the branches has a pole of some type pushing it through the window.
More quotes from National Lampoon's Christmas Vacation
Trivia: When Clark smashes up the decorations when he can't get the lights working, Chevy Chase genuinely broke a finger when he punched Santa, but stayed in character, kicking the decorations instead, and that's the take used in the film.
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Chosen answer: Because there was cat food in her jello mould. He's pointing out the absurdity of someone adding cat food to jello.