through the power of dance, obviously....

yeah i think that one simply escaped through the cracks somehow... i mean its not like its a main plot point or anything,its kinda tame despite being a contradiction lol

I'm more annoyed by the fact that it doesn't respect the voice option you picked.

I noticed this too. Ota's mom also wouldn't have the memory for a full dance routine, but the ending scene is definitely meant to be non-canon, like when actors take a bow together at the end of a play even if their character died.