The trooper is killed at night and Matt leaves right away to go to Fort Dodge to tell the commanding officer. When Matt gets there is it daytime. He talks with the commander for a few minutes, then returns to Dodge and it is the same night that he left. His arrival at Fort Dodge was probably edited in from another episode.
When Corporal Stark tries to draw his pistol at the bar, he is using the wrong hand. The pistol is placed on the right side in a cross-draw holster because the cavalry were trained to draw their sabers with their right hands and draw their pistols with their left hands. Corporal Stark fumbles with the pistol and never gets it out of the holster because he is trying to turn his right hand around backwards, when he should have just cross-drawn with his left hand.