Factual error: When Wayne and Garth are driving to the Alice Cooper concert in Wisconsin, they pass palm trees while driving the expressway from Chicago. There are no palm trees on any expressway in Illinois or Wisconsin. (00:57:00)
Factual error: In some of the shots of the band playing, it is very obvious that Cassandra isn't playing her bass correctly. Particularly in the basement performance, where she sometimes doesn't even move her arms at all while singing. (00:13:25)
Factual error: When Wayne and Garth drive to Milwaukee, they leave Chicago, the sign reads Wilson Ave, when they announce their arrival - a very similar shot pops up reading Wilson Ave.
Factual error: When they are driving around listening to Bohemian Rhapsody in Garth's car they are supposedly in Aurora, IL but Cermak Plaza is in Berwyn, Satchel's is in Cicero and the White Castle is in Lyons. All these towns are an hour away from Aurora.
Answer: There was a series of commercials for a mustard called Grey Poupon in the late 80s and early 90s. It usually involved someone driving up next to a limo in a cheaper car, rolling their window down and asking them "pardon me sir, do you have any Grey Poupon?". Then the richer man in the limo would say "certainly" and pass it to the guy in the other car. They were incredibly stupid commercials and wayne's world makes fun of them.
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