- Awesome Art: This is some gorgeous hand-drawn animation! So gorgeous it's almost always compared to Don Bluth's works in terms of visuals.
- Awesome Music: The Villain Song "Intelligence" has become a fan-favorite. Even fans who didn't like the other songs in the movie tend to like this one.
- Critical Research Failure: Jellyfish and starfish aren't fish. Then again, since "fish" aren't a natural clade (unless tetrapods are to be considered fish) it really doesn't matter.
- The professor's claim that all habitable land would be lost if the polar ice caps melted. Even if that happened, even if the ice covering Antarctica, Greenland and the mountain glaciers melted, the simple answer is, no. The whole world will never be underwater. Our coastlines would be very different. Sea levels would rise about 70 meters (230 feet). But many cities, such as Denver, would survive.
- Cult Classic: This film is pretty much unknown among most people. However, it actually has gained a fansite.
- Ear Worm: The titular theme song will never leave your head. "Suddenly" and "Do You Believe in Magic?" are also very catchy.
- Fridge Brilliance: Why is the shark so dumb? He's a lot bigger than the other fish, so the potion probably didn't have as strong an effect on him.
- Fridge Logic: How does MacKrill know there's a time limit on using the antidote?
- It's possible he's tested it out on someone before.
- That small bottle of antidote sure managed to go a long way and it was already leaking for a bit before Joe found it.
- "Funny Aneurysm" Moment: The professor's memory problems are Played for Laughs in the film. Years later, his voice actor Terry Jones was forced to retire due to an onset of dementia, making it significantly less funny nowadays.
- Heartwarming Moments:
- Fly and Stella once they meet up as fish, with Stella hugging Fly and crying about how scared she was, him hugging her back and comforting her then cheering her up by playing with her.
- Most of Stella and Sasha's interactions are this.
- Moe: Stella is adorable in both her human and starfish forms.
- Moral Event Horizon: Joe is revealed to be completely beyond redemption when he leaves the three children to be eaten by piranhas, knowing full well that these characters are transformed humans that need the potion more than he does.
- Retroactive Recognition:
YMMV / Help! I'm a Fish