Corrected entry: When Jim Belushi and Linda Hamilton go to the Miniature Golf Course, the song "Gimme Some Lovin'" by the Spencer Davis Group is playing. As part of the intro to the song, one lyric is to yell "Hey". The scene shows Jim Belushi lip synching this, but he does so one measure too soon.
Corrected entry: When Courtney Cox fires the gun at Belushi she is holding a .45 automatic. The standard clip holds around 8 rounds and she fires well over that amount. Also with EVERY automatic handgun when the clip empties the slide locks back, which it didn't in the movie.