Used the William Tell Overture as the title theme. A year before the Lone Ranger would appear on radio using the same theme.
Chapter: 8, is a budget-saving recap episode where sequences from Chapter: 1 are shown for most of the running time.
CHAPTER TITLES: 1. Untamed; 2. The Chasm of Death; 3. The Doom Riders; 4. Vigilante Law; 5. The Silent Call; 6. The Heart of the Mystery; 7. The Battle of the Strong; 8. The Missing Witness; 9. The Showdown; 10.The Death Trap; 11.Wild Loyality; 12.The Double Decoy.
The horse that played the title role, Apache, was the horse the boy rode. The horse in most of the action scenes was actually named Rex, and he in fact WAS a "devil horse"--wild, vicious and tremendously aggressive, he had killed one of his trainers several years before this picture was made. Stuntman Yakima Canutt, doubling for Harry Carey, had to try to ride him in a scene, and knew that it would be virtually impossible to stay on the horse for more than a few seconds, so he instructed the wranglers to tie his wrists and ankles around the horse's neck and let go. When you see that footage in the film, in Chapter: 1, Rex is not trying to throw Canutt off--he's actually trying to kill him.
When the Painted Stallion is fighting the black stallion, this scene is taken from The Devil Horse (1926). This battle between stallions has been edited into Wild Horse Round-Up (1936), Comin' 'Round the Mountain (1936), Hit the Saddle (1937), The Devil Horse (1932), The Phantom of the West (1930), Law of the Wild (1934), and The Painted Stallion (1937). The black stallion is actually the famous Rex the Wonder Horse.