Isn't that great? It really makes you appreciate all the extra effort Pixar puts into their films. And it was neat learning about the real Tepuis, and the things that ended up in the film.
The Blu-Ray has some neat featurettes on the 2nd/bonus disk, as well. My favorites are the one about the dogs (they brought in a dog behaviorist), and the "Composing for Characters" one with Michael Giacchino.