The St. Valentine's Day Massacre

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• The film came in at $200,000 under budget because Roger Corman reused sets from other movies, including a mansion that served as Capone's home (even though in reality Al Capone lived in a modest brick home in a working-class neighborhood).
• SPOILER: The movie's mostly historical accuracy also includes some of the real words spoken by those involved in the massacre. Frank Guesenberg's dying answer to the police officer's inquiry really was, "Nobody shot me. Leave me alone". George Moran (IV) really did exclaim to a reporter, "Only Al Capone kills like that." Capone responded to the press: "Only Moran kills like that. I mean, they don't call that guy 'Bugs' for nothing!"
• Jack Nicholson was to play Bruce Dern's character, Johnny May, but instead shows up in a bit part as a henchman, Gino, loading garlic-soaked bullets into a Tommy gun (Nicholson was still paid for all seven weeks of the shoot.)
• For the massacre scene in the garage, the actors playing the slain gangsters were shown photos and directed as how to fall so their positions were identical to the real photos of the massacre. Two actors bumped together on the way down. After studying photographs they realized they had fallen and collided in the exact way the slain gangsters had fallen and had landed in the correct positions.