Coyote Springs is dry, and Jim Harvey is dying of thirst, but his horse "Tumbleweed" digs a new spring, saving them. As Harvey leaves, he sees sheriff Murchorse ride up, walk into the dry spring bed, and collapse. Harvey returns to save the sheriff's life, giving him water, and uncovering the waterhole his horse dug. In the background, beginning at 1:01:28, and clearly visible at 1:01:50 is a wide stream of water.
In his voice-over narration in the movie trailer Audie Murphy says that Apaches attacked the wagon train, when it is made clear in the film that the marauding Indians are Yaquis.
When Jim rips a mesquite bush out of the ground to cover the cave mouth, the roots of the bush have obviously been cut.
About an hour into the film Audie Murphy rides across some clear tire tracks in the desert.
When Audie Murphy arrives to meet the wagon train that is waiting he takes no time to water his two horses but just ties the pack horse to a wagon and goes to the lead to start the wagon train moving. A wagon train would have waited at a location with plenty of good water for a guide to arrive out in the desert and would have been watering all of their animals with at least buckets while they waited.
During the climatic horseback chase scene with Audie Murphy chasing Russell Johnson another "modern-era" mistake is visible. At 1:14:19 into the movie, in the upper right-hand portion of the frame a house is seen with two servicing power line poles clearly in view.