Trivia

For the African scenes, Reginald Denny invented the first radio-controlled model airplane and, with Osmond Borradaile, put a camera on board in 1946.

Later in life, Gregory Peck lamented that he felt this film was overlooked because it was released in between two of his more well-known films: Duel in the Sun (1946) and Gentleman's Agreement (1947). Despite this film's critical success, Peck felt that it quickly became forgotten.

Producer Benedict Bogeaus unsuccessfully lobbied for the film to be called "Congo."

Gregory Peck helped Zoltan Korda land his position as director of the film. Peck recommended Korda to the studio because he had the reputation for creating successful films with exotic locales and intense action sequences.

Reminiscing about the film, Gregory Peck recalled getting along swimmingly with director Zoltan Korda. Peck acknowledged that Korda could be ill-tempered, but he explained that both men mutually admired and respected one another. Peck called Korda one of his favorite directors.