The size and shape of the blood stain on Matt's arm changes, as well as the amount of dirt and sweat on his shirt.
At the end of Part 1, Matt gets shot in the left arm. In Part 2, there is blood on his sleeve, but no bullet hole.
Matt and the posse chase the Stark gang south from Dodge toward Oklahoma, but they end up in a desert area with Joshua Trees, which only grow in the American southwest.