Other mistake: Misty's car at the beginning of the movie crashes into the house presumably breaking through the perimeter wall, certainly does smash through interior walls and furniture, but in the living room it still has every single light, including the side ones, completely whole and undamaged.
Character mistake: Twice over in the movie (when Healy wakes up and when March at the end of the movie drives to his place) billboards for The Comedy Store appear. The program of the evening features comedians such as Tim Allen, Richard Lewis, Robert Klein and "Elaine Boosler." So they misspelled Elayne Boosler's name. (00:10:50 - 01:48:35)
Factual error: Showing the exterior of Healy's apartment, it is established that he lives above the famous stand-up club "The Comedy Store." Showing the entrance though, they show also the board above it which is composed of signatures of famous comedians - most of them who never appeared on it in 1977, when the movie is set. For instance you can see Roseanne (Barr) 's signature on the bottom right corner, and also Pauly Shore's. (00:10:55)
Factual error: The movie takes place in 1977. When the two leads arrive at the party, they are playing the Earth, Wind, and Fire song, "September" which was not even written until 1978. Also, just before they arrive, the soundtrack is playing "Boogie Wonderland," another Earth, Wind, and Fire song that also was not written until March 1978. (The band members at the party look like they are supposed to be Earth, Wind, and Fire themselves.) Later on, the soundtrack plays the Rupert Holmes song, "Escape (Pina Colada). That was not released until 1979.
Factual error: Near the end, there's a scene where they are sitting in their car, and behind them is a late 80's early 90's GMC van (black).
