The scene in which Deborah Kerr cuts her own hair and then cuts to her sunning with a perfectly coiffed hairstyle got such a big laugh at the initial screenings of the film that producers debated removing the scene. However, they couldn't figure out another way to explain Kerr's change of hairstyle, so they kept the improbable scenes intact.
Errol Flynn was originally cast as Quartermain, but turned it down, as he did not desire to sleep in a tent on location in Africa. Instead he did Kim (1950), which was filmed in India, but the accommodations for the actors were at a local resort.
Stewart Granger had the first director Compton Bennett sacked as they couldn't get along and the shooting was going nowhere. The next director Andrew Marton, being a man's man, hit it off instantly with Mr. Granger.
The location footage in this film, especially the various animals, was re-used as stock footage for dozens of films in the fifties and later, including Tarzan, the Ape Man (1959), Watusi (1959) and the 1973 version of Trader Horn (1973).
When they enter the mine, they stop and stare at an unusual formation. It is actually located in Carlsbad Caverns National Park, New Mexico in the primitive "New Cave", not the main caverns. The formation is named "The Klansman".
All Hugo Haas's shots were filmed on stage. A stand-in actor was used on location with the rest of the cast. In those shots you always see him from his back and you never see his face or it's hide with shadows until a close up comes.