Continuity mistake: When Allison arrives at the island in his raft, he sticks out his head to take a look. When his face is seen, his hair is completely dry, but when his back is seen as he prepares to go ashore, his hair is soaked.
Continuity mistake: In the scene where Glen Ford shoots the stagecoach driver dead, the body falls to the ground. Glen Ford gives the order to put the "dead" man on the saddle of a horse. When the men lift him up, the "dead" man puts his right hand up onto the shoulder of one of the men.