Corrected entry: When Monk's funeral procession is going down the street, the dog on Bill's porch appears to be a Doberman. The Doberman did not exist until the 1890s. Any importation from Germany to the US was not until the early 1900s.
Corrected entry: In the scene of Bill the Butcher lying in bed with the naked women, one woman has a noticeable tan line from a bikini - a bit early for the bikini...
Corrected entry: When the four scapegoats are hanged you see two shots of people watching them fall, following them with their eyes on their way down: first the wife of one of the condemned scapegoats, then Bill's followers. The funny thing is that in the second group, only Amsterdam seems to look at the executed, while McGloin and the others keep staring into empty space where the hanged had been before they fell.
Corrected entry: In the movie, Amsterdam says that the New York City Draft Riots lasted for four days. It really lasted only three days.
Corrected entry: Late in the film when Bill is standing outside the barber shop staring down Monk, the Irish man running for Sheriff, Monk holds his club in his right hand with the leather strap around his fist. A quick cut to Bill's straight face, and then they show Monk holding the club in his left hand with no strap visible.
Corrected entry: Near the end, when they are reading off the telegraph messages, one message reports an ironclad lying off the city, ready to act. But the ship we see firing into the city is a wooden ship, not an ironclad.
Corrected entry: Every time you see a person or soldier holding a rifle or pistol, you'll notice that the weapon has no primer cap under the hammer (which means there is nothing to create a spark to ignite the powder) and (especially with the rifles) quite frequently has no ram rods (without which they cannot reload.)
Corrected entry: At the beginning, when the two gangs meet for a fight, there is snow on the ground - indicating that it is winter. But there is no condensation vapour coming from the actors as they speak.
Corrected entry: In the first big fight scene (when Amsterdam was a young boy), the conflict is shown in great detail. Viewers can see the deaths of hundreds of people, most of them occurring in the center of the brawl. However, when the camera pans out at the end of the scene, there are only a few bodies scattered around, and the majority of them are on the edges of where the fight occured.
Corrected entry: In the scene where Amsterdam has slept with Jenny and Bill the Butcher comes into the room, Amsterdam makes a point of covering Jennys shoulder with the bed cover. When Bill has left the room the cover is under Jennys arm even though she hasn't stirred at all.
Corrected entry: The young Amsterdam had very crooked teeth. Leo DiCaprio has much better teeth. I don't think they had braces back then, especially not in asylums.
Corrected entry: Near the end of the movie the Brooklin Bridge is shown. The year is 1863, and the Booklin Bridge wasn't constructed until 1870.
Corrected entry: In the background the flag on a wall has 50 stars. This movie is set long before the USA was comprised of 50 states.
Corrected entry: At the beginning, when Liam Neison is shaving, we see him cut his right cheek with the straight edged blade, but in the next scene, when they're fighting, the cut is on his left cheek.
Corrected entry: Towards the end of the film when Amsterdam and Jenny are standing in the graveyard observing both Bill the butchers grave and Amsterdam's father's grave. On Priest Valon's tombstone it says that he is from Dublin. Earlier in the film Amsterdam says that he is from county Kerry. County Kerry is in the western region of Ireland, while County Dublin is on the eastern region.
Corrected entry: Towards the end of the movie in the riot scene, canons were fired into the middle of the 5 points and exploded in fireballs in the street. Canon balls were made of steel or lead and were used to penetrate the hulls of ships or knock down walls. They were not flying explosive bombs.