The detective investigating the murder of Dave the Drug Dealer and Mark (Gutterson's Army buddy) states that Mark and Dave were shot in the chest, but Mark was shot in the head.
At the shootout, Bob's passenger window is shot out. A few minutes later after Raylan arrives, the window is intact.
Colt mentions that the .45 auto pistol (model 1911) that he carries is his service gun however he stated in earlier episode that he was military police in the Army and military police carry a 9mm like Boyd's. Only certain jobs carry the .45 mostly in the Special Forces and SOCOM fields.
At 24:36, when Boyd and Johnny are riding in a car, through the front windshield the viewer sees brown treeless mountains. Such mountains do not exist in southeastern Kentucky nor anywhere in the eastern United States.