Most of the scenes show Saguaro cactus in the background, indicating they filmed in the Sonora desert in Arizona, but several scenes show a Yucca or Joshua trees trees instead indicating filming in California' Mojave desert.
During the gunfight with the Indians at the beginning, Flint is knocked off his horse, and the horse heads behind Cassie's wagon. When the fight is over, Flint gets his horse, which has somehow gotten tied to a bush behind the wagon.