Revealing mistake: In the film's first scene, as Clark and Russ Griswold make a left hand turn to pull into the used car lot in Chicago, the upper quarter of the screen shows mountains and palm trees in the background, which is an impossibility for Chicago. I believe the nearest mountain range to Chicago is in Arkansas and the nearest palm trees reside in Louisiana. (This scene was filmed in California, which explains the mountains and palm trees, BUT nonetheless a mistake.)
National Lampoon's Vacation (1983)
Ending / spoiler
Directed by: Harold Ramis
Starring: Eugene Levy, Chevy Chase, John Candy, Randy Quaid, Anthony Michael Hall, Beverly D'Angelo, Jane Krakowski, Eddie Bracken, Christie Brinkley, Imogene Coca
The Griswolds finally make it to Walley World, only to find it closed for cleaning and repair. This causes Clark to go temporarily insane. After purchasing a BB gun, Clark holds up the security guard and forces him to allow his family to go on the rides. Eventually a SWAT team turns up and the family are arrested but Clark speaks to Roy Walley himself, reminding him of his own hellish vacation roadtrips. Walley decides to drop the charges, and allows the family (and SWAT team) to remain in the park as his guests.
The end credits show various snapshots from the vacation. The final shot shows that, unsurprisingly, the Griswolds decided to fly home.
Hazax of Rodmore
More mistakes in National Lampoon's Vacation
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.
Trivia: The script was based on writer John Hughes short story called "Vacation 58" which was based on a real life trip he took as a child with his parents in 1958.
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Answer: Harold Ramis voiced Marty Moose.