Before becoming an actor, Dane Clark had some experience as a professional boxer. Freddie Steele who portrays Mike's final opponent Duke Carney, was also a professional boxer before his retirement led to him becoming an actor.
In real life, Dane Clark and Alexis Smith were about the same height. But in keeping with Hollywood convention, and using tricks like camera angles and platform levels, in some shots when both are standing next to each other, he appears taller.
Nitrate prints of this film are held by the UCLA Film and Television Archives. Kodak did not stop making nitrate film stock until 1952.
Production on this film was from March to May of 1947, but it was not released until the last week of 1948, and the copyright was not filed until 15 January 1949.
The $75.00 paid for the painting in this 1948 movie equals about $980 in 2024 dollars.