The Only Line that Mattered
Mario Puzo wanted his novel to be perfectly represented, but he also let Coppola do whatever he wanted... But, he wanted one line to be repeated verbatim. That line is: "A lawyer with a briefcase can steal more than a hundred men with guns." Brando didn't like it, and he refused to say it. Dang!
Literally Shaking
Marlon Brando was an intimidating guy. Actor Gabriele Torrei was so nervous about acting with him that he was physically shaking. Coppola decided to use that footage since it technically fit with the scene!