When Teddy and The Man in Black fight one of Wyatt's men (the first one they come across), just before Teddy delivers the final blow with the axe, Wyatt's man throws The Man in Black on the ground and you can see his hat falling off his head. Four seconds later, The Man in Black rises to his feet with his hat back on his head as if it never fell off.
In Hector's recurring storyline (where he robs the town on a mission of "mayhem") there is a moment where he fires a coup de grâce while the sheriff's deputy is wounded on the ground. As he fires, you can see that a bullet casing appears to eject from the rifle (accompanied by the sound of brass ejecting). However, the rifle is clearly a lever-action, and would not eject the casing in that manner. In the moments after, Hector cycles the action and another piece of brass (shell casing) is ejected from the rifle. The effect was likely added in post-production to add "realism".