Mistakes
In the scene where Clark ties the dog to the bumper of the family truckster, Rusty hands the leash to Clark while the dog is chewing on his leg. The camera changes to show Clark's face close up, and when he pulls the leash to free his leg from the dog, you can see the end of the leash fly behind him (with no dog attached.) See more...
Trivia
Lorenzo Salviati, Beverly D'Angelo's husband at the time, has a cameo as the musician playing the piano at the bar during the scene where Clark meets up and chats with the Ferrari girl (Christie Brinkley). See more...
Movie Mistakes blog
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National Lampoon's Vacation (1983) - 1 quote
Directed by Harold Ramis, starring Anthony Michael Hall, Beverly D'Angelo, Chevy Chase, Christie Brinkley, Eddie Bracken, Eugene Levy, Jane Krakowski, John Candy, Randy Quaid (add more)
Cousin Vicki: I'm going steady, and I French kiss.
Audrey Griswold: So? Everybody does that.
Cousin Vicki: Yeah, but Daddy says I'm the best at it.