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* ApprovalOfGod: Creator/MegumiHayashibara was very satisfied with Creator/AllisonKeith being selected as the official English voice of Nuku Nuku.
* ChildrenVoicingChildren: Ryunosuke's Italian voice actor, Stefano de Filippis, was only 12 years old when the OVA premiered in Italy.
* CrossDressingVoices: Ryunosuke Natsume is voiced by the female Creator/KazueIkura.
* DuelingDubs: Two English dubs were made for the OVA series. The first was produced by Crusader Video in London and was released in 1994. The second, and most well-known one, was produced by Creator/ADVFilms in Houston and was released in 2002 on DVD, eight years after the former dub was released. When Creator/DiscotekMedia acquired the license to the series from ADV, the company included both dubs on their Blu-ray and DVD releases.
* LateExportForYou: The first OVA was released in Italy in 1998, six years after its Japanese premiere.
* SelfAdaptation: Author Yuzo Takada served as a supervisor for the first OVA.
* StudioHop:
** The first OVA was animated by Creator/StudioFantasia and Creator/AnimateFilm. For the TV series and the ''DASH!'' OVA, the animation was done at Creator/AshiProductions.
** The North American home media releases were initially handled by Creator/ADVFilms. In 2018, the rights were picked up by Creator/DiscotekMedia.
** The first OVA's sound effects were handled by Daisuke Jinbo back when he was working at Creator/SwaraPro, the TV series and ''DASH!'' on the other hand were handled by Jun'ichi Sasaki during his tenure at Creator/AnimeSound.
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