These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternative Character Interpretation: Ms. Fieldmouse isn't concerned about Thumbelina at all, she's just pimping Thumbelina out to stay on Mr. Mole's good side without having him consider her as a possible match for him.
Crowning Music of Awesome: "Marry The Mole" may be a bad song, but "Let Me Be Your Wings" is a pretty decent ballad and considered by many to be the best song in the movie.
Ear Worm: The title song, "On the Road" and "Follow Your Heart". Also, "Let Me Be Your Wings" clearly manages to stick to your head after a while.
Hilarious in Hindsight: People who criticise the movie for its Fourth Date Marriage plot, including The Nostalgia Chick, might not have felt the same way had they known the love story is actually an improvement of the original story by Hans Christian Andersen, where Thumbelina and the prince didn't meet until the end and immediately decided to marry. In this movie they meet at the beginning and at least has a Falling in Love Montage which honestly doesn't make it much different from most Disney love stories out there.
Idiot Plot: The only reason Thumbelina keeps getting in trouble is because neither she or Jacquimo can think of her taking a ride on his back; made worse by the fact that Jacquimo thinks finding the Valley of the Fairies is more important than flying her home, as well.
The song "Follow Your Heart", as presented by Jacquimo, underlines this plot hole to the point of insanity. (Lost in the woods? Just follow your heart. I could help you by flying home, but...)
Jerkass Woobie: Sure, Beetle is a shallow, self-absorbed jerk, but the only reason he's working for Grundel at all is because the toad was throttling him and then stole his wings, effectively blackmailing him. It's easy to watch him get dragged around by his ankle the entire way and feel a little bad for him.
The scene where the insects laugh at Thumbelina and call her "ugly". As one Youtube commenter put it, "This movie goes to show you that some creep will call you ugly and it will still hurt."
Unfortunate Implications: How every animal is obsessed with her just for being an attractive human-like woman. Grundel and the Mole want company and the Beetle is lustful and one-sided since he abandons her based on what people think of him.