Freddi Fish/Trivia
- The Danza: Jason, a Putt-Putt Expy from The Case of the Missing Kelp Seeds, is most likely voiced by Jason Ellefson, Putt-Putt's voice actor at the time.
- No Export for You:
- Despite the series being US-based, ABCs Under the Sea was exclusive to Europe for nearly three years.
- The later Tie-In Novels were only published in Dutch.
- Sequel Gap: ABCs Under the Sea was made nearly a decade after the previous game, The Case of the Creature of Coral Cove.
- What Could Have Been: The Anime of the Game was to have been created by Lancit Media Entertainment.