- Box Office Bomb: $28 million went into making the film. Final box office tally? Just over $11 million.
- Cross-Dressing Voices: Mrs. Field Mouse is voiced by Yuji Mitsuya in the Japanese dub.
- Fake Nationality: French swallow Jacquimo is voiced by an Italian-American actor (Gino Conforti).
- Follow the Leader: Don Bluth's first and least successful attempt at copying the Disney formula, mainly The Little Mermaid. Notable examples: using a Hans Christian Andersen story as a basis, casting the voice of Ariel in the lead role, who also happens to be admired for her beautiful singing voice, and including a love duet sung while flying. The storybook in the Framing Device even boasts pictures that look suspiciously similar to stained glass. Apparently, Executive Meddling also played a part in this.
- Throw It In!: Apparently some of the beetle's dialogue was ad-libbed, MarzGurl states.
- Troubled Production: The script was rewritten over and over for nearly a year until, out of sheer desperation to get physical production started, the original screenwriter was fired and Bluth was forced to write it himself in a single week. This is his only solo screenwriting credit.
- Thumbelina was the first ever animated film to win a Golden Raspberry Award (for "Worst Song").