Plot hole: When Wolf and Tony find Virginia in the Huntsman's tree house, she tells them that he chained her up, so she can't go downstairs and open the door from the inside. However, after Wolf climbs her hair and enters through the window, the two of them walk down the stairs without any chains stopping her. They couldn't have cut her free with the magic ax because Tony was holding it, and he was downstairs by the door.
Continuity mistake: When Tony is stuck in the tunnel in the prison and is talking to Wolf, there are still several feet of tunnel ahead of him before the end of the tunnel. But when Wolf gives him a push, he is shown coming right out of the tunnel's end.
Snow White: Why did I let her in? Didn't I know she was bad? I did. Of course I did. But I also knew that I couldn't keep the door closed all my life just because it was dangerous. Just because there was a chance that I might get hurt.
Answer: It's the sound of his bad luck coming.