Die schrillen Vier auf Achse

All the cast members had terrible experiences when it came to filming the scenes inside Walley World, where they rode all of the roller coasters and other rides. In the commentary, Chevy Chase mentions that many of the rides made him and the other cast members vomit, especially since they all had to ride them several times for each take. Dana Barron mentioned in the commentary that the coasters made her so sick, she had to take motion sickness pills and would pass out on nearby benches between takes. Finally, Anthony Michael Hall mentions that in the shots on the roller coaster where he looks scared, he wasn't acting, his fear in those shots was genuine.

Ellen's hairstyle changes quite dramatically towards the end of the film (at around the time that Aunt Edna is dropped off at Flagstaff), from wavy to a poodle perm. Result of last minute reshoots.

During the credits, you see snapshots of group photos of where and who the Griswalds met on the vacation. The last photo shows you how they got home, on a plane.

When originally released in theaters, the song "I'm So Excited" by The Pointer Sisters was present, but quickly withdrawn, having June Pointer's "Little Boy Sweet" replace it; hence why it does not appear on the soundtrack. Mistakenly, the song is credited (as should be) but not featured in the film on VHS or DVD, just when shown on TV. "Summer Hearts" by Nicolette Larson was apart of the original ending to the film, and only remains on the soundtrack.

Edited into Knight Rider: Knight of the Juggernaut: Part 1 (1985)