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.
Fanon Discontinuity: Aurora's segment from the Compilation MovieDisney Princess Enchanted Tales: Follow Your Dreams hasn't gotten much love from the public. Its crimes include turning the princess into a ditz, and boasting animation that fails at evoking "a moving illustration." Even Aurora's original voice actress, Mary Costa, believes it justifies Disney's refusal to make a full-length sequel. (read the second page of this interview)
Hell Is That Noise: The music you hear when Maleficent hypnotizes Aurora. If you listen carefully it's actually singing "Aurora...". The voice calling out even changes from language to language.
Magnificent Bastard: In the face of everything, even her minions' stupidity, Maleficent always somehow manages to get ahead.
Moment Of Awesome: For how nightmarish Maleficent's dragon form is, it makes Prince Phillip's takedown of her one of the greatest moments of the Disney animated canon.
Older Than They Think: Much of the music and songs were heavily borrowed from Tchaikovsky's music for the ballet of the same name. For instance, "Once Upon a Dream", the movie's most notable song? Boom. In some parts, it's actually taken a step further: some parts of the movie's incidental music actually use movements from Tchaikovsky's original ballet with slight reorchestrations in some places! One of the most prominent examples is the use of Puss in Boots and the White Cat as the music with which Aurora pricks her finger.
Weird Al Effect: Directly resulting from the above, it becomes difficult to watch the ballet once one is familiar with the film, as the same score cues two completely different events in the ballet and film. Hearing the waltz would probably also cause several viewers to mentally hear the lyrics to "Once Upon a Dream" and/or "I Wonder" despite no one actually singing them.
The Woobie: Poor Aurora. In many scenes, she looks like a kicked puppy.