Even though all the original soldiers were shot and killed, their uniforms had no holes or blood on them when the outlaws put them on.
For the size of the gold bullion and the blacksmith's forge, the gold was melted down too fast for the time frame of the story. And when it was solidified into more manageable pieces, the men were handling it with no problem, even though it should have still been too hot.
After the townsman sees the outlaws (dressed as soldiers) beat up Jim Garvey, when the witness moves away from the brick wall, the set wall shakes.
The morning the men are going to look around town for chains, a man is walking past the land office toward the camera with a sack on his shoulders. As he nears the camera, he quickly glances at it, then looks straight ahead again.