* TheDanza: Jason, a VideoGame/PuttPutt {{Expy}} from ''The Case of the Missing Kelp Seeds'', is voiced by Jason Ellefson, Putt-Putt's voice actor at the time.
* 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 were late made available on Steam, at least.
* 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.
** All other Freddi Fish titles (including the rest of Humongous' titles, excluding ''The Case of the Missing Kelp Seeds'') were never released in Sweden or Norway.
* 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.
** ''The Case of the Missing Kelp Seeds'' was originally being developed for [=MS-DOS=] with low-res (320x200) art similar to the first 2 VideoGame/PuttPutt games. The art style was eventually retooled and led to the hand-animated art style that made the game a KillerApp for early multimedia computers.
** In addition, Freddi and Luther's designs were ''vastly'' different in this iteration as well; Freddi had a pink and purple look (nicknamed the "Barbie" design by the original team), where Luther was still green but had a big nose and a much more comical design.
* WordOfGod: Reportedly, the scene of Freddi getting misgendered in the second game by Mr. Triplefin and her response ("Excuse me, sir, but I'm not a boy. I'm a girl") was a result of the common ViewerGenderConfusion not just by children, but by outlets such as magazines and news articles. The development team threw that scene in to set the record straight.