The Dead End Kids terrorized the set during shooting. They threw other actors off with their ad-libbing, and once cornered co-star Humphrey Bogart and stole his trousers. They didn't figure on James Cagney's street-bred toughness, however. The first time Leo Gorcey pulled an ad-lib on Cagney, the star stiff-armed the young actor right above the nose. From then on the gang behaved.
A montage features a shot of gangsters bombing a storefront. This shot is an alternate angle of the bombing of a store in El enemigo público (1931).
To play Rocky, James Cagney drew on his memories of growing up in New York's Yorkville, a tough ethnic neighborhood on the upper east side, just south of Spanish Harlem. His main inspiration was a drug-addicted pimp who stood on a street corner all day hitching his trousers, twitching his neck, and repeating, "Whadda ya hear! Whadda ya say!" Those mannerisms came back to haunt Cagney. He later wrote in his autobiography, "I did those gestures maybe six times in the picture. That was over 30 years ago--and the impressionists have been doing me doing him ever since."
The title of the film is referenced in Mi pobre angelito (1990) and its sequel. In the two movies, Kevin watches two gangster movies called "Angels with Filthy Souls" and "Angels with Even Filthier Souls".
Because of the controversy over gangster films, the picture was banned outright in Denmark, China, Poland, Finland and parts of Canada and Switzerland.