found some easter eggs:
1) From Main Menu, highlight Set-Up. Press right, down, then left to highlight a button. Press enter to view a storyboard of the cafeteria fight scene.
2) From Bonus Features Menu, highlight Alternate Opening. Press right then down to highlight a bolt. Press enter to view character design gallery.
3) From Backstage Disney Menu, highlight Welcome to Sky High. Press right then down to highlight a guinea pig. Press enter to view a short featurette on the real guinea pigs used in the movie.