- Primo Carnera was the world's heavyweight boxing champion when this film was made and released. He refused to make the movie using the first script, which had him knocked out in the end, but agreed to a revised script with an additional $10,000 salary.
- Max Baer was the leading heavyweight contender for the title. Both he and Carnera made their motion picture debuts in this film.
- In an interview, Myrna Loy stated that Max Baer carefully watched Primo Carnera's boxing style during the filming and used this information to beat Carnera in their real-life match for the title in March, 1934.
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