Mistakes
In the scene near the end, when the two cops are fighting in the "out of control" bi-plane, the plane is seen looping and twisting as the "pilot" Tack has jumped out. However, in the side-on view of them fighting you can see a new pilot trying desperately to stay out of shot, but failing due to the g-forces he is under while the plane moves around. See more...
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Police Academy 4: Citizens on Patrol (1987) - 4 quotes
starring Bobcat Goldthwait, Bubba Smith, David Graf, G.W. Bailey, Michael Winslow, Steve Guttenberg (add more)
Cmndt. Eric Lassard: What is the most frustrating thing about police work?
Tackleberry: Not being able to carry hand grenades, sir.
Lt. Debbie Callahan: Separate locker rooms, sir.
Mahoney: Icky blue uniforms.
Sgt. Eugene Tackleberry: You want to become one with the gun. Feel the gun, caress the gun until it's a living, breathing, vibrating extension of yourself.
Mahoney: I look for the same in a woman.
Zed: People just don't understand me.
Laura: Maybe if you talk slower...
Zed: No, I mean who I am. Man, now I have to worry about my diction too?
Captain Harris: Don't touch those! Don't you ever touch my balls without asking!