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- "Yumemi" means "beautiful dream". "Okazaki" is a common Japanese surname meaning "mountain". It may also be a reference to the Japanese biologist Reiji Okazaki.
- Yumemi appears on the cover of Phantasmagoria of Dim.Dream along with all the other characters in that game.
- Yumemi is one of the few PC-98 characters who has a full in-game portrait. (The portrait appears when she is casting a special attack.)
- Yumemi's alternate outfit in character selection has a red bow tie, but when she is casting a special attack, her bow tie is purple instead.
- Yumemi is the only final boss of any of the games that is a pure human. Mima, Ghost; Byakuren, Magician; Miko, Saint; Kanako, Goddess; and so on.
- She is one of the Touhou characters (along with Kaguya, Nue, Byakuren, Komachi, Parsee, Kisume, Shinki and so on), that doesn't wear hats.
- She is similar to Hori from the anime Planet Chasers Starlight Excellent. They are both professors, and they both want to kidnap the main characters, Also, Yumemi's alternative palette bares a striking similar resemblance to Hori.