In order to show cinematographer George Barnes how he wanted the film to look, Abraham Polonsky gave him a book of Edward Hopper's Third Avenue paintings.
The lighthouse shown at the end is The Little Red Lighthouse, located under the George Washington Bridge, next to the Hudson River.
Had a major influence on Martin Scorsese as it's the first movie he remembers having watched.
John Garfield stood on an apple box for the scene between him and Marie Windsor, because she was taller than him.
Joe correctly quotes the actual New York State legal code to Leo regarding the numbers or "policy" rackets, when they argue in Leo's office.