The technical consultant for this film is Thomas B.D, a retired detective who has worked for the Boston Police Department for 30 years.
Initially, Jack Nicholson did not want to appear in the film, but after meeting Martin Scorsese and Leonardo DiCaprio, he finally decided to play Frank because he had appeared in a series of comedies before. , He hopes to play the bad guy again, and he thinks that Frank in this film is the ultimate incarnation of evil.
Martin Scorsese once gave the script to Mel Gibson, hoping that he could play a certain role in the film, but Gibson had already started directing "Apocalypse" and was unable to act in the film.
Dennis Leary was invited to play Digenan in the film, but refused because of a time conflict with the TV series "Rescue Me" (Rescue Me).
Gerard McSorley (Gerard McSorley) was the candidate to play Quinan.
In order to play the role of Colin, Matt Damon went to the police station to experience life, patrolled with police officers, participated in anti-drug operations, and was taught some vocational skills.
Director Martin Scorsese originally wanted to shoot the film in Boston, but because of the 15% tax break, he shot most of the film in New York. Although the filming plan in Boston has been reduced to 6 weeks, it was still divided into two parts, the first half was filmed in June, and the second half was filmed in August.
Leonardo DiCaprio was invited to star in "The Shepherd", but gave up to join the film.
Martin Scorsese had hoped that Kate Winslet or Hilary Swank would play Madeleine.
"Fuck" is said 237 times in the film.
"Cunt" (damn) is said 22 times in the film.
Brad Pitt refused to play Colin in the film.
