After Lucas refuses to fight the young Gridley, Lucas realizes that the boy is riding out to confront Mark. Lucas has been wearing short sleeve shirts the entire time but when he runs out to jump on his horse, he has a long sleeve shirt on. On the ride to the ranch Lucas has long sleeves but when he arrives he is again wearing a short sleeve shirt.
I believe this is footage from an earlier show, where Mark was working for Nels Swenson, and he took a shortcut to a customer's ranch and ran into trouble. Lucas was shown running and jumping on his horse with long sleeves just like in this episode.
Just after Lucas places the matches atop the hitching post, he turns and walks slowly back towards Micah in a diagonal direction. When he calls for his rifle and quickly spins to shoot at the matches, Lucas is now standing directly in front of the hitching post as he fires his rifle.
Lucas pushes 6 wooden matches, by hand, into solid wood. An impossibility in and of itself. He manages to do so with only breaking one of the matches slightly. Then he fires 6 rounds from his Winchester lever action grazing the match heads just enough to ignite them. Then Gridley Maule Jr. fires 6 rounds from his single action revolver putting the 6 matches out. In all of this hail of gunfire not one round in twelve strikes the building behind the hitching post.