* CutShort: In both versions of the anime, it ended before the official resolution to the plot. In Japanese it ended after 150 episodes, right after the battle with Zeno. The Dub cuts out at 104 right before the start of the Faudo Arc.
* FandomNod: The ending of the manga, which includes a group photo containing nearly every single demon who appeared in the series.
* OfficialFanSubmittedContent: A card was decided by a contest.
* RelationshipVoiceActor: Zatch and Zeno's Japanese voice actors, Creator/IkueOtani and Creator/UraraTakano, are respectively [[Anime/{{Pokemon}} Pikachu and Raichu]]. [[spoiler:Given that they're brothers, this was quite the casting call.]]
* ScrewedByTheLawyers: The legal fight between Makoto Raiku and Shogakukan resulted in Raiku gaining ''total'' control over everything he ever made, this series included. It also rendered all preexisting contracts null and void, effective immediately. That meant Creator/{{Viz|Media}} was forced to stop publishing the English translation of the manga (one of their best sellers outside the ''Jump'' line) just a few volumes from the end.
** The series has since been republished in Japan by Kodansha (who also publishes Raiku's other lesser known series, ''Manga/AnimalLand''), but there's no word of it being republished anywhere else.
* TheOtherDarrin: Zatch's seiyuu switched in the final ten episodes due to Creator/IkueOtani's maternity leave.
** In the dub, Kanchome was originally voiced by Creator/RichardStevenHorvitz, but was later voiced by Jeff Nimoy for the rest of the dub's duration
** Also Sherry was originally voiced by Creator/SaffronHenderson, but she later moved back to Canada as she was barely getting any work in LA and as a result Sherry was voiced by Creator/KarenStrassman from episode 85 until 104, the point when the dub was cancelled
*** And no for those who are unaware, Karen Strassman unfortunately doesn't get to display her superb French accent skills here, despite Sherry being French
* TalkingToHimself: The dub was cancelled before the Faudo arc, so this is averted for Zatch and Zeno.
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