Other mistake: At the bus station Hayley manages to score 25250 at Double Dragon. Jimmy needs to beat this score so Corey gets his $6.70. During the Double Dragon montage of Jimmy playing trying to beat Hayley's score, the first footage we see of the score, its already at 27850. Strangely Corey waits till Jimmy is at 29920 until he's satisfied that Hayley's score is beaten and he snatches her money from her hands.
Other mistake: Near the end of the movie there is a montage scene of acceptance letters being printed followed by the reactions of the various people who received the letters. Despite these form letters being sent on the same day the date on some of the letters is April 11, 1988 and the date on others say April 11, 1989.
Other mistake: When Martin Short accidentally fires a shot into the bank ceiling, he is holding the gun at an angle. However, plaster drops on him from directly overhead instead of from where the gun was aimed.
Other mistake: When they are shooting at Quik hiding in the store, the guy with the small guy shoots 7 times, but he has a six-shooter.
Other mistake: At the beginning of the film, there's no way Angela would possibly have been able to know the exact moment the girl would have been walking down the street and what she'd be wearing so she could be wearing the exact outfit.
Other mistake: Fletch complains to Frank that he needs a vacation. Frank replies that he gets one in July, which is 2 months away, making the present day somewhere in May. He later gets a call stating he inherited an estate. Amanda meets with him and is later murdered. The documentation shows she was cremated on March 5, 1989. The cremation should be in May.
Other mistake: When Tod has almost finished speaking to Helen after he's told her about his conversation with Gary, her hands are resting on the cooker ring. She had just been frying chicken so these rings should be scalding hot and she wouldn't have been able to rest her hands on them.