- The "bridge over the deep chasm" scene where Annie, the elephant, shakes a rope bridge trying to cross was actually filmed on a bridge 8 feet off the ground. The background was a realistic painting of a chasm.
- The battle between the Thuggees and the British Indian army was added when RKO considered the ending too bland.
- Eight makeup artists were sent to the Lone Pine set, where they worked for the six weeks of location shooting. - Over 600 extras were employed in the Mount Whitney scenes.
- Howard Hawks was the original director, but was fired from the project after his previous film, Bringing Up Baby (1938), was a box office bomb.
- Excises, in some prints, the actor playing Rudyard Kipling, and in that version, when the poem "Gunga Din" is read, the actor has been replaced on one side of the screen by a rather shaky matte.
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