Ernest Borgnine met his future wife Katy Jurado while working on this film. A reporter saw the two laughing over lunch one day and started a rumor that the two were involved romantically, which Borgnine insisted for the rest of his life was not true. The story persisted, though, and Borgnine's wife ended up divorcing him because of it. Ironically, he and Jurado grew closer and closer because of this trouble, and ended up marrying in 1959.
Ernest Borgnine, introduced to Yuma through the opening scene setting of this movie(Yuma Territorial Prison) heard there was superb small bird hunting in the area. My dad and I used to see him early mornings at breakfast every fall for years thereafter at the old Stardust Hotel where he stayed while bird hunting.
When Alan Ladd observes Sam Edwards being flogged inside the Arizona Territorial Prison, he does so with a practiced eye having been flogged himself in "Two Years Before the Mast" (1946) and "Botany Bay" (1953).