Sammy Davis Jr. lost an eye in an automobile accident en-route to the recording studio to record vocals for this film.
The picture downplays Jerry Florea's nation of origin. In recent prints, as Jerry [Tony Curtis] talks about fighting deportation actions threatened against him, he says, "I don't know a soul over there" --- meaning the country to which he would be deported. Careful observation reveals that he actually said, "in Italy", rather than, "over there", indicating that the line was overdubbed later.
Sal Mineo said Robert Taylor tried to seduce him during filming.
Actor Jeff Chandler wrote the lyrics for the title song "Six Bridges to Cross" which is sung by Sammy Davis, Jr.
Despite various claims, it is not actor Jeff Chandler who narrates the film, but rather Jay C. Flippen, who plays police officer Vincent Concannon.