Continuity mistake: When the four scapegoats are being hung, the man on the extreme left makes a speech. While this goes on, the man on his right has his noose tightly round his neck. When he finishes, the crowd clap and the hangman pull his hood down over his face the noose on the man next to him is still tight. The scene cuts to the front of the gallows, and the hangman now put the noose over the head of the man next to him.
Continuity mistake: In the shot when Amsterdam is lying on the table and Bill's cleaver is rotating in the air you see that he is wearing a checkered black-and-white scarf. This wasn't there before, and it's gone right after, and it would have been visible the way he was manhandled by Bill's men. (01:42:15)NancyFelix
Continuity mistake: When Jenny and Amsterdam are lying in bed Bill suddenly sits in a chair next to the bed. He has an American flag draped over his shoulders. The way the flag is folded on the stars side changes when Amsterdam asks him if his shoulder is keeping him up, without Bill changing position. (01:22:45)NancyFelix
Continuity mistake: In the battle of Five Points a witch-like women with steel claws jumps at a man, already flashing her teeth in anticipation of a good bite. Before she lands on him she lowers her head that it ends up below his shoulder, but when the camera angle changes she's biting off his ear. (00:08:50)NancyFelix
Continuity mistake: Before the big battle of Five Points begins Bill's gang comes out from a decrepit house. In the first wide shot of the place there is no smoke coming out ouf the chimney of the adjacent house to the right, but a moment later when Bill's people start to emerge it's smoking heavily. (00:06:00)NancyFelix
Continuity mistake: When the second battle in Paradise Square is about to begin, Vallon is holding a length of chain in his left hand. Shang, standing beside him, is carrying a pole with dead rabbits hung from it. In a later shot, just before the naval bombardment, Vallon is holding a knife in that hand while Shang is now holding the chain. (02:28:30 - 02:29:55)
Continuity mistake: In the opening scene, priest Vallon cuts the right side of his face with the straight razor. Later on, when Bill and Vallon are belittling each other before the brawl, there is a scar on the left side of Vallon's face.
Revealing mistake: During the theatre scene, when the camera is behind the hanging actor and the crowd begins to throw fruit at the stage, the screen very briefly shakes; the cameraman was hit.