Most of the scenes Lucas shirt sleeves are rolled up to the elbows. Also after the Marshall comes to talk to Lucas and then rides off…..Lucas shirt sleeves are rolled up to the elbow as Will is standing at the barn door.
Next scene Mark jumps off the wagon and there is a close-up of Mark and Lucas shirt is buttoned to the wrist. It’s like they reshot this brief scene or added it later. Thanks wildwest!