Revealing mistake: During the ninja fight on the ship, Jones' punches miss by far.
Police Academy 4: Citizens on Patrol (1987)
21 mistakes
Starring: Steve Guttenberg, G.W. Bailey, Bubba Smith, David Graf, Michael Winslow, Bobcat Goldthwait
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.