Visible crew/equipment: When Neil (De Niro) breaks into Van Zant's apartment and shoots him, watch as Van Zandt flies backward. You can see a wire running up through the bottom of his sweat pants.
Visible crew/equipment: In the drive-in shootout scene, the camera and crew are visible in the rear view mirror in the cab of the white Dodge pickup fleeing De Niro and Kilmer.
Revealing mistake: In the scene when Pacino leaves the police station to go to his hotel for a shower, the camera is pointing up a tree lined street. Watch the pedestrians - they are all standing still until the car comes into view then someone obviously shouts action and they all start walking.
Visible crew/equipment: In the scene where Hanna and Casals break into Hugh Benny's apartment, when they break down the door it can be seen that a stuntman is filling in for Pacino.
Continuity mistake: When Neil sets off the fire alarm in Waingro's hotel, there is a little red sign above the fire alarm when shown from far away. When it shows his hand up close pulling the alarm, the red sign is gone.
Continuity mistake: In the shootout scene when they drive away in the car, De Niro is seen in slow motion as he realises there are cops in front of them as well as behind. He raises his weapon and fires, knocking the rear-view mirror off the window. In the shot directly after he is seen still firing his weapon and the mirror falls off the window again.
Continuity mistake: When they torch the ambulance, you can see a dealership emblem that says "LEADER" right above the Chevrolet emblem on the back door of the ambulance. It is visible right after Chris puts the bomb in. In all other shots with the ambulance, this emblem isn't there. Obviously the "LEADER" ambulance is a "fake" that they used just to burn and destroy.