Watch the scene where Nicolas Cage is escaping from the prison. He's standing on a scaffold and his fellow inmate, the big guy, is shot and goes over the side. Nicolas Cage grabs the barrel of the assault rifle he's managed to get ahold of (do they carry assault rifles in prisons?) and keeps him from falling, despite the fact that he weighs about 150lb.s and the guy falling weighs about 250lbs. The slip-up occurs during those tense moments that follow when the barrel begins to slip out of Nick's hand. We see a close up of the barrel and see Nick's hand already slid all the way to the end of the barrel so that the big dude is about to drop to his death. The next shot is a wider scene of the whole ordeal and we see that Nick's hand is now all the way back down the barrel nearer to the stock. Next shot, close up, barrel slips out, big dude falls, big dude dies, bad, bad movie continues...