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.
YMMV: Return to Oz
Alternate Character Interpretation: The Girl who rescues Dorothy at the Beginning whom Dorothy sees as Ozma at the end. Is she just Ozma's real world counterpart like how the other characters are, and if so did she drown? Is she Ozma's soul reaching out to Dorothy, thus making her the same character? Or is she Ozma's soul appearing to her as a figment of her imagination, as she get's into closed rooms, and the Doctors never seem to acknowledge her? If that's the case, can she interact with the real world in a limited capacity, seeing as she untied Dorothy, or was that also imagined, and she just wasn't tied in well?
Complete Monster: Princess Mombi somehow manages to outdo the Wicked Witch of the West in sheer unpleasantness: let's start with the asking price for helping the Nome King- the heads of several beautiful women. Mombi keeps these heads, still alive and still conscious, in a hall of cabinets; every so often, she'll "slip into something more comfortable" by swapping heads. And when Dorothy arrived in the Emerald City, Mombi had her imprisoned, fully intending to keep her there until she reached adulthood just so she could have a fully-mature head to add to her "collection."
Crowning Music of Awesome: The whole soundtrack can go from eerie to sad or magnificent, and sprouts a wide variety of music, going from orchestra to silent era piano to a creepy mandolin or a modern techno for the Nome King.
Narm: The Nome telling the Nome King that Dorothy has A CHICKEN!!
The Nome King rising up gigantic and surrounded with flames as the embodiment of satanic evil and the first line that comes out of his mouth sounds like "S'UP!!!" in a deep rumbling voice (he's actually saying "STOP!!!").
Additionally him revealing that he has the Ruby Slippers. Yep the Big Bad king revealing he's wearing a pair of glittery red high heels.
Strawman Has a Point: The Nome King points out that as the precious stones of the world are made and owned by Nomes, those humans who mined and used them are actually guilty of theft. True, it doesn't actually excuse him for invading Oz just to retrieve the Emeralds and turning the inhabitants to stone, but still...
Apparently diplomacy and negotiating went right out the door when he became king.
Tear Jerker: The end credits and ending in general have a very sad tone, even with the happy ending.