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There is an original passage in the film where a mob took a gun and fired directly at the audience from the screen. This controversial scene was unbearable because of the shooting incident of "The Dark Knight Rises", so Warner Corporation decided to completely delete the related film passages. In order to ensure the integrity of the film and the continuity of the story, the company decided to remake part of the plot, and the film's release time was moved from September 7, 2012 to January 11, 2013.
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Jamie Fox was once the candidate to play Coleman Harris.
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Before Emma Stone, more than a dozen female stars including Ashley Green, Lily Collins and Amanda Seyfried had auditioned for the role of Grace.
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Brian Cranston was once the candidate to play the role of Marcos Kennand, but he dropped out of the crew. The reason is that he wanted to shoot "Escape from Tehran."
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Before Miri Inos got the role of Kone, both Amy Adams and Kate Winslet were candidates for this role.
Gangster Squad behind the scenes gags
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Grace Faraday: What's your racket, handsome?
Sgt. Jerry Wooters: I'm a bible salesman.
Grace Faraday: Want to take me away from all this and make an honest woman out of me?
Sgt. Jerry Wooters: No ma'am, I was just hoping to take you to bed.
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[first lines]
Sgt. John O'Mara: Every man carries a badge. Some symbol of his allegiance. His were the scars of a boxer who'd used his fists to climb the social ladder of the mob. A Jew who'd gained the respect of wops through a homicidal lust. He'd sworn an oath of violence. And his master? His own insatiable will to power. He wanted to own this town. His name was Mickey Cohen.