It wasnt a damn layer "error" guys
The character was put in the bottom layer because he was behind doors and people and shit, when he stepped out of the door, his animation continued in later layers but KKU simply forgot to put a blank keyframe on the bottom later when he got out of the doorway.
Either way none of this should even matter right? The movie is great, smoothly animated and very interesting. I'm sorry I'm so late on reviewing it but I couldn't help but notice these reviews taking off points for the fact that you forgot to put a blank keyframe like one time. its not even that big of a deal really.