- The models of King Kong were only 18 inches high.
- Jungle scenes were filmed on the same set as the jungle scenes in Most Dangerous Game, The (1932).
- The large gate that was built for this movie was set on fire and pulled down by hidden cables as part of the burning of the Atlanta Depot scene in Gone with the Wind (1939).
- King Kong's roar was a lion's and a tiger's roar combined and run backwards.
- Willis O' Brien created several models for an earlier production called "Creation". Because of the depression, this production was abandoned. Not to waste all that work, O'Brien went on to use many of the models made for "Creation" in "King Kong". Not the least among these were the T-Rex and the pteranodon. Merian C. Cooper decided the best way to sell the idea for "King Kong" to RKO was to shoot a stop motion sequence. O'Brian shot the battle between Kong and the T-Rex. The executives of RKO were stunned at the results, having never seen anything like it.
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