Revealing: In the scene where Bronson is chased up onto the rooftop by one of the gang members, Bronson pushes the guys over the edge of the building, and it is visible that it is a dummy taking the fall.
Revealing: Kersey shoots a man through a garbage can. As the man falls over, an undetonated squib can be seen on the far side of the can.
Continuity: One car gets shot at, and bullet holes are all over it, in the sides/windshield etc., but in the car crash, tumble and explosion, they are gone.
Audio problem: When the policemen are beating Kersey in the interrogation room, the words that they are saying do not at all match their mouths.