The inflamed reverend falls through the window when Liz shoots him. In the exterior shot there's nothing burning outside the cabin. (This could have been done deliberately for reasons explained in Trivia)
When Elizabeth falls down in the Barn she hits her Head on a Barrel and passes out. That Barrel is missing in the next shot.
When hanging up the laundry at the start of the film, the articles of clothing change.
The Accles & Shelvoke captive bolt pistol used to kill the pig was invented in 1903. Though the movie does not specify what year it is, the voice-over talks about 'the old century ', which means the epilogue is probably set in the 20th century and the rest in the three decades before.
When a bad guy is shot in his head in the desert, blood is splattered on the camera lens .
During buggy ride in snow, her brother is shot and she tells her daughter Sam to go back to sleep using sigh language as she cannot speak. A few seconds later she speaks to Sam telling her to remain in buggy no matter what happens. It ,perhaps, could be attributed to her son, but he is shot and cannot speak nor know Sam is awake from his position.