When Fly and Chuck have an argument Fly's flippers change from brown to gray.
Joe, being a pilot-fish, lacks stripes.
Fly's fish form looks nothing like a California flying fish.
Fly throws starfish Stella into the ocean when he cannot find an empty tank to put her in. He had to walk past the empty tank the professor was going to use to get to the window.
The kids are all called fishes, but Fly and Sasha are the only fish in the group.