In the opening scene when King Triton arrives at the arena, you can briefly see Mickey Mouse, Goofy, and Donald Duck in the crowd of sea-people.
Ariel's body type and personality in the 1989 movie were based on child star, Alyssa Milano from "Who's the Boss?"
Ariel's hair movement was modeled after footage of Sally Ride's hair in space.
odi Benson, the voice of Ariel, sang "Part of Your World" in the dark to get the underwater grotto feel.
Ursula's spell on Ariel contains Latin references to "throat, voice," and "fish."
Sebastian was originally supposed to have a British accent, not a Jamaican one.
The character of Ursula was originally created for Bea Arthur, but she declined because she was busy with "The Golden Girls."
The dress Carlotta wears is the same as the one wore by Cinderella, plus a head scarf.
17 year old Christopher Daniel Barned recorded the voice of Prince Eric. His voice was later chosen to play Prince Charming in the second and third "Cinderella."
When Scuttle breaks Ursula's necklace near Ariel's feet, Ariel is barefoot. Next time we see Ariel, she is wearing shoes.
The shark has a name: Glut. He was planned to return for a rematch with flounder later on, but that somehow never panned out.
During the wedding scene, the Grand Duke and King from Cinderella can be spotted in the background.
Several backgrounds used during "Kiss the Girl," were refurbished from Disney's earlier flick, The Rescuers.
Ursula was originally supposed to be Triton's sister.
Ursula's look was based on drag character, Divine.
The rainbow at the end is inverted.