Audio problem: After the ninja fight, Lassard knocks down a ninja hitting him with his baton, but no noise is heard, making it a really lame and fake hit.
Police Academy 4: Citizens on Patrol (1987)
1 audio problem - chronological order
Starring: Steve Guttenberg, G.W. Bailey, Bubba Smith, David Graf, Michael Winslow, Bobcat Goldthwait
Revealing mistake: When Sweet Chuck is sitting on a bench in the gym reading a paper, the big heavy comes down and sits next to him. Sweet Chuck goes flying up in the air a second before the big guy sits down.
Captain Harris: Don't touch those! Don't you ever touch my balls without asking!
Trivia: This was the last film in the Police Academy series to feature Steve Guttenberg as Carey Mahoney, the main protagonist of the series up to this point.