In real life, Helen Morgan married three times. In the film, she never marries.
When Larry robs the liquor warehouse, he pulls out a crate at the top of a stack. The crate directly beneath it partially pulls out under it, too, and it tilts down slightly. If the case was filled with full liquor bottles, as it supposedly would have been, it would have been too heavy to have moved in this way.
Paul Newman's character, Larry Maddux, repeatedly refers to Florenz Ziegfeld as "Ziegfield." All the other characters say Ziegfeld's name correctly.