Deliberate mistake: In the final scene when the four cars are driving away there is a road sign that shows how many miles it is to Chicago (where the main characters are from). In reality there would not be such a sign because there is not one direct route from Vegas to Chicago. A typical road sign would show the nearest cities.
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Vegas Vacation (1997)
1 deliberate mistake - chronological order
Directed by: Stephen Kessler
Starring: Chevy Chase, Randy Quaid, Ethan Embry, Beverly D'Angelo
Genres: Comedy
Continuity mistake: At the beginning of the movie, when Clark is driving down the street looking at the map, there are 4 kids roller blading in the street. In one shot, one of the kids jumps onto a parkway lawn to avoid being hit by Clark's bad driving. Next shot, when they pan back to the kids, all 4 are still on the street.
Cousin Eddie: That's it Clark... show him who's boss. It's people like you who come here and blow the family nest egg that built this town... not this pretty boy.
Question: How much money did the family win after playing Keno?
Chosen answer: $25,000. Given to the Griswalds by Sid Caesar's character just before he passed away.
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Answer: The sign said $30,000.