Factual error: In the funeral procession scene, the priest is wearing the maniple on the wrong arm. The maniple is a 2 ft strip of ornate cloth prescribed for use in the Catholic Mass before Vatican II in the early 1960s. It is actually worn of the left forearm; however, in this scene it is on the priest's right. (00:49:10)
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.Tina Gilliam
Continuity mistake: The moment when Bill attacks Vallon is very badly edited. There's a shot of Bill raising his cleaver, and it must be at Vallon because he had his eyes fixed on him already for a while. Then you see Vallon's arm crushed by a halberd, then again Bill staring at Vallon, then Vallon turning around, unharmed as it seems, and finally Bill slashing Vallon with his cleaver. (00:09:55)NancyFelix
Revealing mistake: In the beginning of the Five Points battle it happens very often that people get hit badly with a sharp weapon but don't receive any wound. Watch for example in slow-motion how Bill sets out to mow down victim after victim with his cleaver. Later into the fight it becomes a lot bloodier, and sometimes the blood seems to come out of the weapon (e.g Monk's club seems to have a generous blood reservoir). (00:08:15)NancyFelix
Continuity mistake: When Amsterdam meets Jenny for the second time he is seen stealing what looks like an apple and is in his right hand. When she runs away he doesn't have the apple, but when the when the shot is on Amsterdam the apple reappears for him to throw it to the ground. (00:45:30)
Continuity mistake: When Jenny rubs her fingers over the old scars on Amsterdam's chest, you can see light under the tips of the scars as if they peeled up. (01:05:50)
Continuity mistake: When Amsterdam tries to kill the butcher and fails, the butcher straddles Amsterdam on a table and tosses a cleaver in the air. The cleaver rotates counter-clockwise so that the blade is rotating backward; however, when the cleaver lands, it is rotating clockwise so that the blade sticks into the wooden table. This would be impossible the way the cleaver is tossed into the air with a back-handed flip. (01:42:15)
Factual error: The prayer uttered at the beginning of the movie ("Saint Michael, the Archangel, defend us in battle; be our protection against the wickedness and snares of the devil") was composed by Pope Leo XIII in the year 1884. The movie is set during the American Civil War in the 1860's.movies
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: The scene where Amsterdam is climbing on the Portuguese ship, we see that there are still four people left in the small boat and we see that Johnny is the first one on the ship, so how did the rest of the gang board the ship before Johnny and Amsterdam? They even know that the ship has been ransacked. (00:39:05)
Other mistake: In the sequence where the "Natives" celebrate the 16th Anniversary of their victory over the "Dead Rabbits," we can see that the year is 1863 while the battle shown in the beginning of the movie happens in 1846. Shouldn't they have been celebrating 17th anniversary instead of a 16th?