All of the pieces played are well known classic pieces, played by real pianist specifically for the show

Most songs played were by the famous pianist Frederic Chopin.

The cat was a symbol of Kaori.

The tune Kaori plays in the scene where Kousei first meets her is "Morning in the Slag Ravine" (from Castle in the Sky (1986)) by Joe Hisaishi.

The second collaboration with Erica Mendez and Rachael Lillis after Hunter x Hunter (2011).

The black cat is a symbol of Kousei and the dove is a symbol of Kaori

Nao Kashiwagi has brown hair and eyes, and freckles on her face.