The IESB has posted three behind-the-scenes clips from Disney-Pixar's Up. In total, it's 15 minutes of straight up, fly-on-the-wall making-of goodness, with none of the gloss one might expect from a Disney promo. Yeah that's right. It's 15-minutes of watching a dude sitting in front of a computer while it renders seven frames of the movie. There's also this part where Pete Docter orders a cheese sandwich from the cafeteria.I kid, I kid. It's pretty cool. Watch the other clips after the jump.