Huey actually blows his cover for pretending to be deaf in front of Mr. Smith, and gets away with it. When Smith tells Huey that he remembers a shoe shine to cost two bits, Huey responds with a head nod and a slight grunt.
Once Gene Watson gets to the hotel and realizes who he's been sent to kill, he checks his watch. The watch in the closeup is a round watch. As we walks off and speaks to another person the watch on his arm becomes visible. It is a square faced watch.
When Watson pulls the Governor's picture from the envelope, we can see through the photo, revealing that the face is visible to him. In the next shot, Watson starts pulling when only the hairline is visible.
Huey (the shoeshine man) tells Watson that he was wounded while serving in the Army Artillery Corps. First, the Artillery is a branch, not a corps. Second, Huey wears a Combat Infantryman's Badge on his vest. That award is given only to infantry troops.