Continuity mistake: When Jack Twist is chopping wood, right before Joe Aguirre visits him on his horse, he sets up a piece of wood to chop. Jack talks to Joe and when the camera pans out to show him ready to chop again, the piece of wood is gone.
Continuity mistake: In the scene when the man on the horse tries to get the case, you can plainly see that his scar changes from dark to bright red and then back again.