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: After Bill the Butcher stabs and beats Amsterdam's face badly (and brands him with a hot knife) notice how as time passes the wounds heal then reappear in varying degrees of severity. This is particularly true with the branding, which is almost absent by the end.
Continuity mistake: At several times during the movie, Butcher Bill's glass eye changes to what looks like a normal eye.
Continuity mistake: In the scene where Bill is cutting up the pig and is about to show Amsterdam the "kill" spots, he wraps up a piece of the pig for an old woman standing nearby. He throws the meat to Amsterdam to give to her and then reaches to unsheath a knife strapped to his right side. After Amsterdam gives the woman the meat and turns back around the shot cuts back to Bill and he is seen unsheathing the same knife he was holding seconds before.
Continuity mistake: During the theater scene a man tries to murder Bill the Butcher but Amsterdam saves his life. As Amsterdam is wrestling with the culprit his hat falls off but in the next shot it's back on, then off again.
Continuity mistake: When Jenny tells Amsterdam that she's leaving for California, she is seen walking through a stone walkway. The camera angle changes and she is seen just turning around a corner and the walkway is nowhere to be seen.
Continuity mistake: At the end of the fight in the bar between Amsterdam and Bill's Irish henchman, Amsterdam is in four consecutive shots from two angles bent over in pain, leaning back, doubled over again, and leaning back again as Bill approaches him.
Continuity mistake: The scene during the riot where Bill and Amsterdam are fighting in the smoke, Bill takes what looks like shrapnel to the side of his stomach, but when Bill and Amsterdam face off (standing on their knees) just before Amsterdam stabs Bill, you can see Bill's vest has no cuts or blood from the shrapnel he just pulled out of his gut (and it looks like he is wearing a new vest).
Continuity mistake: During the funeral, when they are transporting the coffin in the street, there's a dog besides Bill the Butcher. He keeps changing place.
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: When Jenny is picked as the queen at the stepping ken, as the older man walks up to her she is seen putting her hands on her waist. As the camera angle changes she is seen putting her hands on her waist again.
Continuity mistake: When Amsterdam is fighting Bill's henchman, Bill tells his other men to get Amsterdam off the man. You see his other men reaching for Amsterdam and when the camera angle changes, you see them reaching for him again.
Continuity mistake: After saving Bill, Amsterdam is met by his father's old friend. As Amsterdam goes to walk away, he is grabbed by the friend. Camera angle changes and he is seen being grabbed again.
Continuity mistake: When Amsterdam and Jenny are kissing after the dance, He tells her to wait and she is seen lying on top of him. Camera angle changes and she is now seen lying next to him.
Continuity mistake: At the beginning of the riot, some rich men are talking while playing snooker. The balls are placed differently depending on the camera angle.
Continuity mistake: When Bill is talking to the Mayor about politics, he is seen making gestures with his hand as he walks, but when the camera angle changes, his hand is tucked into his jacket.
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.
Suggested correction: In the first shot he was shown in the mirror.
Continuity mistake: When Amsterdam is walking with Jenny after getting back his necklace, he is seen wiping the blood on his neck. Camera angle changes and he's not wiping the blood, and when the camera angle changes again he's wiping the blood again.
Continuity mistake: When Bill wraps meat up in newspaper and tosses it to Vallon to give to the old women and the two kids the little girl gets up and stands on the left side of the old women in the next shot the girl is on the right side of the old women.
