Continuity mistake: When Julian Kay is tearing apart his Mercedes to look for the stolen jewels, he is seen pulling some plastic off the driver's door, in the next shot, you can still see the plastic attached to the car door.
Continuity mistake: In the bus scene at the beginning, the little girl with braces (played by a nonspeaking extra) is seen at the front of the bus, on one side of the fight. Then she is seen near the middle of the bus, on the other side of the fight.
Visible crew/equipment: In the bar fight scene, the camera crew is visible right after Lefty hits one of the bar patrons.
Other mistake: When Tommy tries splashing Rosa during their match she hits the ring mat with her chest and stomach yet seconds later she's somehow knocked out. I never saw her head hit after multiple viewings of that scene.
Continuity mistake: Gus Soltic at the beginning of the movie pours ketchup on the eggs. When he's done, he moves away the bottle in one shot, but it's still vertical above the eggs in the next shot. (00:02:00)
Revealing mistake: Linderman refuses Clifford's offer to be his personal bodyguard from Moody's gang, and leaves. As Clifford walks by the students practicing their violins, playing Mozart, their bow movements do not match the music.