Audio problem: When Colin answers Costello's phone, we hear the girl ask, "Where the hell are you?" but her mouth actually asks, "Where the f*** are you?"
The Departed (2006)
1 audio problem
Directed by: Martin Scorsese
Starring: Alec Baldwin, Mark Wahlberg, Matt Damon, Jack Nicholson, Leonardo DiCaprio, Martin Sheen
Continuity mistake: When Ellerby attacks the guy for not installing the cameras in the right place, he knocks off a map from the board. A second later Ellerby is still going after him, and the map is fixed.
Frank Costello: How's your mother?
Man: Oh... I'm afraid she's on her way out.
Frank Costello: We all are. Act accordingly.
Trivia: This was Martin Scorsese's first film to win Best Picture. And his first Oscar for best Director. Martin also said that this was the first movie he ever made with a plot.
More questions & answers from The Departed
Answer: The FBI and police are separate organizations that do not share full information. Only the FBI and Costello himself knew about the informing, and the FBI can only do so much to stop Costello being caught without drawing attention to their relationship. The police and Costello's gang are fighting a separate battle, hence the two moles.