I wish I had the foresight to write down all the names of the creative team but to isolate so few would be unfair to the 2,000,000,000 people that worked on this movie. Disney, long the leading studio in terms of animation quality, has the squash-stretch animation down to a science. The result has always been to have a ball suspended above its background, with no interaction of the elements, creating a different kind of static image. You may have noticed in Antz, for example, that the lovely, textured rust colored bodies pretty much looked the same all over, unless the character was In Shadow or In The Sun. Here, very facet of the ants pastel bodies is glimmering iridescently, and generating shadows consistent with the light source.
Leaves are faintly translucent.
Shadows of leaves glimmer with the leaves' translucence. A million tiny hairs on a dandelion seed each carry or deflect the light. As characters walk, the ground reflects up onto their skin and the sun moves as they move away from it. It's just absolutely lovely. I can't even isolate any real examples, it just looks natural.