Because he disliked the script for this movie so much, James Cagney had the sides of his head shaved for the film, without the knowledge of either director Michael Curtiz or producer Hal Wallis; Bette Davis did not appreciate it either, and refused to have publicity pictures taken with Cagney.
Gladys Farrell was portrayed by Mayo Methot, who was Humphrey Bogart's third wife. They were married for seven years, during which Bogart suffered her drunken abuse. He left her for Lauren Bacall.
Jimmy Cagney utters the phrase, "the dirty rat," which will be used as his catch-phrase for years to come.
The title of this movie became the nickname of real life criminal Jimmy Burke, who is portrayed by Robert De Niro in Goodfellas (1990).
During the film, Cagney's character is offered afternoon tea in an uncomfortable social setting, which shows off his lack of social graces. While sipping his tea with a biscuit, his stomach growls and gurgles as comedic relief. The same scenario was played out in "The African Queen," when Charlie Allnutt (Humphrey Bogart) has tea with Rose Sayer (Katharine Hepburn).