After the attempted jailbreak, Matt and Thad go back into the office. From outside, it is seen that the door to the cell area is closed, but once they get inside, it is open.
In the final shoot out, Matt is shot in the shoulder and emerges from behind the rock holding his shoulder. However, only moments later, when he returns to the boy tied up to the tree, Matt acts as if he had no injuries at all.
During the attempted jailbreak, Thad looks like he has a pack of cigarettes in his left breast pocket, and then when he and Matt go back into the sheriffs office, it's gone. They did not even have packs of cigarettes back then.
In Matt's office, when the newspaper man is yelling at Thad, he says, "Until the time when this sort of thing is faced up to with a sight more anger...", the last couple words are not what his lips say.
When two of the gang attack doc, one hits him in the back of the head, the other punches him once in the face. But Doc now has a bruise on his forehead, toward the upper right side, and one to the left of his left eye.