When Doc gets a bottle out from a small cabinet on the front wall of the Marshal's Office, there is a seam where two pieces of scenery come together. It could be said to be an expansion joint, but there is a gap straight down the middle of the joint. And when the office is seen from the outside, the front door of the office is on the far side of the building. And there's not as much wall on the outside as there was shown to be on the inside.