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.
Audio problem: When the Queen is speaking to the Troll King for a second time in the mirror, she wraps up discussion with him and in the next shot she walks over to her mirror and says, "Mirror, talk to me, why haven't you found Windell yet?" The Queen's mouth moves ahead of the actual voice.