Visible crew/equipment: In the scene where Laura is being attacked in the desert, the camera swings wildly. During this swing, the entire crew becomes visable for a split second. You can see Clint Eastwood (who also starred in the film) sitting in his director's chair, wearing a white t-shirt and watching the filming closely.
Continuity mistake: When Josey was in the general store picking up supplies with the Indian man and women, Josey was handed a picture of Slim Fixin. If you watch carefully, he walks out with the picture. When you see Josey after he has walked out of the general store, he does not have the picture in his hand.