Continuity mistake: At the end of the electric chair scene, after Drumgoole confesses, Meissner orders the guards to cuff Leone. It shows a guard cuff Leone's right arm, while his left hand is still strapped to the switch. The shot changes to a wider angle and Leone's hand has already been unstrapped from the switch and both arms are cuffed.
Continuity mistake: In the scene where First Base is in the gym shooting pool, after he takes a shot, he places the 2 ball in front of the cue ball to take the next shot. When the camera angle switches to behind First Base to see the convicts approaching, now there is the 12 ball in front of the cue ball.