Michael Mann visited inmates in Folsom prison to gain some insight into prison life, to aid his depiction of Neil (Robert De Niro). Mann later commented that Neil's collars were always perfectly starched, as they would have been in prison.

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Michael Mann

Michael Kenneth Mann (born February 5, 1943) is a film director, screenwriter, and producer. Major films include the period epic The Last of the Mohicans, the drama The Insider, the biopic Ali, and the crime films Heat Collateral and Public Enemies.
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