Revealing mistake: In the close-ups of the elves during the Coronation Ball, you can see the fishing wire used to attach their wings to their backs.
Revealing mistake: In the close-ups of the Queen as she dies, you can see the line of her wig on her forehead.
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.
Elf Girl: There are three things you mustn't do under any circumstances. Don't drink the water.
Elf Girl: Don't eat the magic mushrooms.
Elf Girl: And whatever you do, don't fall asleep.
Answer: It's the sound of his bad luck coming.