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.
National Lampoon's Christmas Vacation (1989)
Plot summary
Directed by: Jeremiah S. Chechik
Starring: Chevy Chase, Juliette Lewis, Diane Ladd, Beverly D'Angelo, John Randolph, Johnny Galecki
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More mistakes in National Lampoon's Christmas Vacation
Clark Griswold: [reciting 'Twas the Night Before Christmas.] When what to my wondering eyes should appear, but a miniature sleigh, and...and Eddie with a man in his pajamas and a dog chain tied to his wrist and ankles. What the...?
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.