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: When Clark starts to set up his Christmas lights, there is a scene where the ladder collapses. If you look closely you can see the wire coming out from under his jacket to keep him from falling forward. (00:20:55)
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: Clark Griswold in the attic watching old movies dressed in a woman's turban and gloves to keep warm is not only funny but a reference to the Norma Desmond character from "Sunset Boulevard", who watches her old films to remember her Hollywood glory days.
More questions & answers from National Lampoon's Christmas Vacation