Revealing mistake: The king's youngest daughter is not supposed to see her beary husband's face while he is doing his midnightly human stints. Of course, she blows everything by watching her sleeping beau in candlelight and dropping wax on his forehead. Why is there so much light after the candle is blown out?
Revealing mistake: When the Polar Bear King comes to the Winterland castle for the second time the locals try to stop him. If you watch the encounter in slow motion you see that a) the bear's paws have the texture of a sturdy mat and b) the old guy who is being hit loses his balance in due anticipation.