The fact that Toys for Bob went above and beyond and redesigned every single dragon in the first game to the point that there's a Divergent Character Evolutionpage to explain everything. Their TLC towards the trilogy is so evident and touching...
The scene where Hunter and Bianca kiss is made even better by them having a Twirl of Love before, including a happy giggle on Bianca's part, and an affectionate gaze between both.
The 100% Completion ending. The original version tried to show the adult dragons interacting with the babies in a heartwarming way, but did it so badly it was a downright Gainax Ending. The Reignited version shows it with much more success.
An example: The scene ends with a baby burping at Spyro's face. In the original, Spyro shakes his head for no darn good reason. In the Reignited, Spyro replies with an affectionate noogie.