- Actor Allusion: When setting out to find the now-fish-ified kids, Professor MacKrill (Terry Jones) sings to himself that he must "find the fish."
- Fan Nickname: "Snapefish" for Joe, due to sharing the same voice actor (Alan Rickman).
- What Could Have Been: The pilot trailer for the film showed the characters with completely different designs and names.
- There seemed to be a cut character from the film that would have asked the protagonists to stop Joe's reign, which would've led to a scene where they use the fish potion to revert the fish back to normal.
- Sasha is absent from the trailer, implying that she was created later.
- In the trailer Professor MacKrill says that the potion turning people into fish is an accident, meaning that in the original story the potion had a different purpose. It was most likely meant give people fish-like capabilities but not turn them into fish entirely.
Trivia / Help! I'm a Fish