Revealing mistake: Their mother tells Fritz to come with her out of the room so Drosselmeier can visit with Marie. As he is getting up, a sudden imperfection in the art appears as a crude white line appears on the chest by he bed and stays there as he moves.
Revealing mistake: Marie and Nutcracker go down the river in a swan shaped boat, and Nutcracker is standing up on the back moving the boat along with large pole. In the water, you can see the reflection of the boat and Marie the way they are supposed to be. But the reflection of Nutcracker is not moving, and the pole is not reflected.
Answer: The original 1816 story "The Nutcracker and the Mouse King" by ETA Hoffmann features the seven-headed Mouse King. Since then there have been numerous adaptations and re-imaginings of that story in literature, on stage and screen in different forms. In the classic versions the Mouse King has seven heads wearing seven crowns, other versions he has only one head, and in a few versions three heads. In the original and other adaptations the number seven is specified several times: Marie Stahlbaum is seven yrs old; the seven-headed Mouse King; the seven steps backwards; seven little crowns. The makers of this animated movie chose to feature the classic Mouse King.
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