* TheDanza: Jason, a PuttPutt {{Expy}} from ''The Case of the Missing Kelp Seeds'', is most likely voiced by Jason Ellefson, PuttPutt's voice actor at the time.
* HeyItsThatVoice: Mike McAuliffe, the voice of Luther, would later go on to voice [[StarFox Slippy Toad]].
** In France, he is voiced by JackieBerger, who is TheManOfAThousandVoices.
* KeepCirculatingTheTapes: Want the UK dub of the fifth game? Good luck -- only '''fifty''' copies of it are known to exist. The German version is less severe, but is still incredibly rare.
** Some of the games are now available on Steam, with more coming later.
* NoExportForYou:
** Despite the series being US-based, ''[=ABCs=] Under the Sea'' was exclusive to Europe for nearly three years.
** The later [[TieInNovel Tie-In Novels]] were only published in Dutch.
* SequelGap: ''[=ABCs=] Under the Sea'' was made nearly a decade after the previous game, ''The Case of the Creature of Coral Cove''.
* WhatCouldHaveBeen: TheAnimeOfTheGame was to have been created by Lancit Media Entertainment.