Continuity mistake: The rear of the steer carcass was on fire and smoldering, but not seconds later in the aerial view. Also in the aerial view, the position of the steer relative to Alexander was different. (00:06:00)
Continuity mistake: The way Alexander's scarf is wrapped and tied (on the right or left side) varies. For example, the scarf was wrapped below his neck and tied in front when he came through the door, but seconds later the scarf was up to his lower lip. A little later, the scarf was tied on his right side. (00:09:02 - 00:09:23)
Continuity mistake: Alexander still had the mark/cut on his forehead, running vertically to the outer edge of his right eyebrow, when he found the "Mars" candy bar, but it was gone less than 30 seconds later (after he found the gun). The angle as well as its appearance (wider, longer, straighter, and more pronounced) of the mark/cut on his right cheek also changed. (00:02:20 - 00:03:26)