Although production was shut down for a time after Errol Flynn suffered a mild heart attack, he came back and finished the picture.
Former Junior Welterweight champion Mushy Callahan not only trained Flynn for the film's fight sequences, his feet doubled for the actor in the shots that showed off his famous footwork.
During the filming of Il sentiero della gloria (1942), Errol Flynn suffered a mild heart attack. His weak heart kept him from serving in the Armed Forces during World War II.
The sailing ship used during the dock-side fight was the same one used in Lo sparviero del mare (1940).
According to "Variety," the real Corbett was "self-effacing" and had a "quiet personality.," which is at odds with the brash extrovert that is pictured in the film.