Other mistake: When the mastermind is first shown behind his screen, he inflicts spittle onto one of his gang members by saying "plan is preceding perfectly." However, the mastermind is talking from behind a screen, and thus it would be impossible to get them.
Police Academy 6: City Under Siege (1989)
1 other mistake - chronological order
Directed by: Peter Bonerz
Starring: Bubba Smith, David Graf, Michael Winslow, Leslie Easterbrook
Visible crew/equipment: When Jones is fighting the bad guy, at the end they both jump in the air doing Karate kicks and you can see the mattress when Jones lands.
Mayor: Hello, guys and gals! Oh, boy. I wish I had a picture of your stupid faces.
Captain Harris: Mr. Mayor.
Mayor: Hello, Harris, you stupid twit.