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?"
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The Departed (2006)
1 audio problem - chronological order
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.
Colin Sullivan: I'm going to need the identity of your undercovers.
Dignam: Blow me, all right? But not literally, though. Unfortunately, there's no promotion involved for you.
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.
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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.