Near the end after the son shoots his abusive father, Lucas dives and tackles the son. Immediately, the apparent stunt man puts his hat on possibly to mask that his hair is much darker. But when the camera cuts to Lucas standing up, he has no hat on.
Lucas is shown to have the measles with numerous dots on his face which were obviously made with make up and look like freckles. Measles usually has a rash like appearance in addition to the spots. Earlier when Mark has the measles, he has no spots or rash on his face.
As old man Healey and his boys are riding toward the McCain ranch, the sky shows a vapor trail from an airplane which would not have existed back in the day.
Toward the end Hattie stops by Lucas' home to talk with Lucas and Mark. The front door is the two-piece "Dutch" type and only the top half is open. The front door shown before and after this one is a normal one-piece door.