- This is Disney's last hand drawn cartoon and camera shooting at the same time. The film used thousands of different colors as the background images of one thousand and one hundred, drawing a total of more than one million pictures.
- Shirley Stone is Ariel's prototype model.
- This is the largest cartoon produced by Disney since the Fantasia "Fantasia" (1940). The two-minute scene of the storm alone took more than a year to complete with 10 special effects artists.
- The director team insisted that millions of bubbles must be drawn by hand rather than copied. This is a very human job, which is undertaken by a Chinese company based in Beijing.
- Ariel's lip line is creatively drawn with ink.
- This is the first time Disney has tried to shoot with a multi-faceted camera that is famous all over the world in many years. Unfortunately, because the machine was too large and heavy, all efforts failed. The multi-faceted camera had to be sub-leased to other companies and ended up.
- Following the fiasco of The Black Hole in 1979, the film served as a symbol of Disney's ten-year financial recession and finally regaining growth.
- Hans Christie Andersen's fairy tale "The Little Mermaid" was once used by Walt Disney with "Symphony of Confusion" as the background music, but it was replaced in another classic story by Andersen, "The Ugly Duckling".
- In Greek mythology, Poseidon is the god of the sea, and Tridon, who is a fishtail, is just one of his sons.
- Some of the background images used in the "Kissing Girl" scene are from 1977's "Little Hero".
The Little Mermaid behind the scenes gags
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Ursula: [singing] If you want to cross a bridge, my sweet / You've got to pay the toll / Take a gulp and take a breath and go ahead and sign the scroll! / Flotsam, Jetsam, now I've got her, boys / The boss is on a roll / This poor unfortunate soul!
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Sebastian: Ariel, where are you going?
[He swims up to her and observes that she is swimming with Flotsam and Jetsam]
Sebastian: Ariel, what are you doing here with this riffraff?
Ariel: I'm going to see Ursula.
Sebastian: [gets a shocked look on his face and gasps] Ariel, no! No!
[He begins tugging on her tail fin, trying to pull her back]
Sebastian: She's a demon! She's a monster!
Ariel: Why don't you go tell my father? You're good at that!
[She shakes him off]