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
Continuity mistake: When Harris is briefing the new group for the first time, Hightower loosens the leg of Harris' chair so that it breaks when Harris sits down. When Harris gets up from the middle of debris, the next shot shows an innocent looking Hightower and the chair is intact in front of him.
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.