Factual error: In a scene set in 1862 or 1863 Bill the Butcher says: 'An Irishman will do for a nickel what a ****** will do for a dime or a white man for a quarter'. The first nickel 5 cent piece was coined in 1866. At the time of the scene the 5 cent coin was a small silver coin called a half-dime.
Trivia: At the end of the film you see two gravestones, "Priest" Vallon and William Cutting. Behind them is a river, with a view of lower Manhattan after that. You see a bridge being built, and the city growing and changing. The two men had to have been buried in Brooklyn, rather than Manhattan for this view.
Question: Can someone please explain to me why the audience and Amsterdam are supposed to hate Butcher so much and think he's a loathesome person? He killed Vallon during a fight, fair and square, and was nothing but respectful to his dead enemy. He almost seemed to have regretted killing Vallon. He didn't act like a worse scum than anyone else until quite a while into the film.