- Robert Donat was cast in the title role, but didn't turn up at the start of shooting. Warner Brothers scrambled to find a replacement, asking Brian Aherne to take the role, but he refused. Warners decided to took a gamble on an unknown Australian named 'Flynn, Errol' .
- No full-sized ships were used in the battle scenes. It was created by a combination of process shots, miniatures, and footage from the silent film, The Sea Hawk (1924), which was based on another Sabatini novel.
- Because, Erich Wolfgang Korngold had only three weeks for scoring this picture, he used portions of two tone poems by Franz Liszt for some of the action scenes. However, he insisted on the screen credit "Musical Arrangements by" although still 90 % of the score was original.
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