- Otto Brower and Osa Johnson followed Stanley's path through Kenya, Tanganyika and Uganda with their crew and returned with 100,000 feet of film for use in the safari sequences.
- The movie was dubbed into Spanish, Portuguese and Dutch.
- Neither Spencer Tracy nor Walter Brennan ever actually went to Africa during the making of this film. Stand-ins for both of them were used in the long shots during the safari sequences, and whenever Tracy or Brennan were shown "on safari" in close-up against African scenery, they were acting in front of a rear projection screen.
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