When Mark is thrown from his horse to the ground, the first shot of him shows his left leg stretched straight (based on the upper part of the pant leg that is shown). When a wider angle is shown, his left leg is bent at the waist and not straight.
After Lucas has nicked one of the bandits, one stands guard while the others go by the fire. Lucas is hiding behind a rock. As Lucas lends his body on the rock it wiggles each time he moves.
During the show Lucas has to slap Mark to keep him awake. Lucas softly backhands him while wearing a glove yet you hear a slap as if skin to skin contact.