Continuity mistake: During the opening scene of the film we see two boxers fighting in Julian's boxing club. The fighter in red trunks knocks out the one in blue trunks and is announced the winner. Two men then come into the ring and, between shots, we see them pick up the loser off the floor twice. (00:02:51)
Continuity mistake: As El Camaleon pulls the Cuba Gooding Jr. face off, there's an unshaven neck with a tattoo visible under it. After the cut, Lady Gaga's face (also presumably unshaven admittedly, but not visibly so) comes to light under a mask of visibly lighter skin tone. (00:45:05)
Continuity mistake: When Irving goes to see Carmine near the end of the film, his glasses start out being tinted, but when he takes them off, as Carmine hits and kicks him, the tint has gone; even outside they're tint-free.
Continuity mistake: At the beginning of the film when the girl is shot, in the close up there is no debris on her face, but the next wider shot shows her face covered with dirt and other bits of debris.
Continuity mistake: At the beginning, the little girl's body changes position. When the trucker finds her, her lips are slightly apart, but when the police examine her body, her lips are closed.
Continuity mistake: When they are discussing whose pinkie gets cut off, Vince grabs Craig by the neck and pushes him against the refrigerator. Craig is first shown pushed against the right hand side of the refrigerator, but whenever the camera is on him for the rest of the scene, he is shown standing against the left hand side of the refrigerator.
Continuity mistake: In the scene where Terrence Howard is questioning Colin Farrell his right hand first appears with a ring and watch, later in the scene it appears on his left. (01:08:25)
Continuity mistake: When Oscar is on the phone to learn about the location of the job interview in the warehouse district, the paper that was on top of the payphone jumps suddenly in the hand that holds the receiver to his ear, with the phone call already being over. (00:22:25)
Continuity mistake: After stabbing the bad guy at the beginning, Callahan for some reason pulls back and somehow dives past a door managing to drag in a grown woman who was all crouched down by the entrance. Wonky physics of it aside, the bad guy shoot at him, but shoots just a hole in the door frame. The hole appears to be CGI, and in fact when Callahan shoots back from the bedroom, the hole is gone. (00:01:35)