Revealing mistake: Throughout the film and specifically near the end after Jim has reclaimed Bess and the colt, there are visible horseshoes on the supposedly "wild" horses. While there would logically be a number of abandoned and escaped horses among the herd at any one time, those who joined them in a shod condition would not remain so very long in rugged country. Those born into the wild would never have worn shoes. Reason dictates there would be very few if any horses remaining shod at any one time.
Continuity mistake: When Jessica has gone over the cliff in the dark we can see that she is wet, dirty and her hair is plastered to her head and is under her collar. The shot changes to show how precarious her place is on the side of the cliff. However, in this shot, the stuntperson's hair is quite dry and over the collar. Also noticeable is the change in shape of the rock. When she falls at night, she falls onto a very flat and rock - in the morning, it is a different shape entirely.
Trivia: After all the men have gone off in search of the horse, Spur is left behind at Harrison's homestead to flirt with Mrs. Bailey. He playfully chases her around the kitchen table and in so doing passes a platter of chicken. Without pausing, Spur sweeps down, grabs a chunk and takes a ravenous bite, then continues his lap around the table. As he approaches the camera on the near side, he starts to speak and a small chunk of chicken is shot from his mouth directly in to his up swinging hand. He then places his hand on the table to deposit the chunk of chicken.