- 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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Ariel: [singing] I wanna be where the people are, I wanna see, wanna see 'em dancing, walking around on those...
[turns to Flounder]
Ariel: What do you call 'em? Oh... feet!
[Ariel playfully tugs on Flounder's fins]
Ariel: [continues singing] Flippin' your fins, you don't get too far, legs are required for jumping, dancing! Strolling along down a...
[pause]
Ariel: What's that word again? Street! Up where they walk, up where they run, up where they stay all day in the sun, wandering free, wish I could be part of that world!
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Ariel: [singing] What would I give if I could live out of the water. What would I pay to spend a day warm on the sand. Bet'cha on land they understand that they don't reprimand their daughters. Bright young woman, sick of swimmin', ready to stand! And ready to know what the people know, ask 'em my questions and get some answers! What's a fire and why does it... what's the word? Burn! When's it my turn? Wouldn't I love, love to explore that shore up above? Out of the sea, wish I could be part of that world!