The sequence in which hundreds of African natives attack the safari before being turned back by fire is taken from Stanley and Livingstone (1939). Note that star Jim Davis is costumed very much like Spencer Tracy was in that film. If you look closely, the rifles used in 1939 footage and this movie's spliced-in scenes are different models.
In the original uncut version the scene showing lava is in red tint. Most versions shown on television have this in black and white.
Even though the film was originally released in black and white, the 1997 VHS release of the film has a scene shot in Technicolor.
Opening credits: All events, characters and firms depicted in this photoplay are fictitious. Any similarity to actual persons, living or dead, is purely coincidental.