2. The name of the Irish gang "Dead Rabbits" in the film is derived from the Gaelic "dod ráibéid", which means a big man who is irritable and irritable.
3. Bill the Butcher in the film originated from Bill Poole, a native of New York at the time. Poole was a butcher and later became a professional boxer.
4. In order to better shape the role, Daniel Day Lewis, who played the role of Butcher Bill, once followed a butcher to learn the craftsmanship of slaughter.
5. There are as many as 100 characters with lines in the film, and the working hours of background actors total more than 22,000 hours. In addition to some Italians, the crew also recruited many American soldiers stationed there as extras.
6. The filming took 137 days in total.
7. In order for the characters in the old New York background to speak up, the crew invited the dialect coach Tim Monich to teach the actors the Manhattan dialect in the 19th century and various underworld jargons at that time.
8. During the filming period, George Lucas visited the Italian studio. He told Scorsese that the set can be generated by computer.
9. The film was originally scheduled to be shot in 1980 or 1981, but due to the box office failure of "Heaven's Gate" in 1980, the producers began to have lingering fears about historical works, so the filming plan for the film was shelved.
10. During the filming, Daniel Day Lewis kept talking in the dialect of the film.
11. In the late 1970s, Scorsese had hoped that Malcolm McDowell or Robert De Niro would play Amsterdam.
12. Robert De Niro and William Dafoe were the first candidates to play Bill the Butcher.
13. During the filming of an action scene, Leonardo DiCaprio injured Daniel Day-Lewis’ nose. Despite the injury, Daniel Day-Lewis still insisted on shooting.
14. The original soundtrack of the film was completed by the composer Elmer Bernstein. Daniel Day-Lewis also used his soundtrack to experience the role.
15. Martin Scorsese and Leonardo DiCaprio once dropped their remuneration to pay for the shooting.
16. The film shooting budget was originally set at 83 million U.S. dollars, but later rose to 97 million.
17. Heather Graham, Monica Porter, Mina Suvari, Melanie Linsky, Vanessa Shaw, Christina Ricci and Claire Franny have all worked Hope to play Jenny.
18. The film was originally scheduled to be released on Christmas Day 2001, but the release date was postponed for one year.
19. Scorsese once hired an Italian thief to teach Cameron Diaz pickpocketing techniques.