Ginty couldn't return for reshoots so for scenes in which John wears a fireproof mask and burns down the gang members with a flamethrower were filmed with Robert Ginty's stunt double. Originally the only scene where John used the flamethrower to kill the gang members was in the ending when he burns the last few after he already killed most of the others with weapons from the garbage truck. so a double was used for scenes where you never saw his face, the most obvious scene is when he phones caroline and then runs to her home to find her dead.