During Buzz Lightyear's speech in chapter 14 you should try to switch to the French audio track on the disc for a change. If you do so, you will notice that the music in the film has been replaced for that version. Instead of the American National Anthem that is underlying Buzz's speech in the English version, you can now hear Randy Newman's 'One World Anthem' instead. For the uninitiated, it is practically impossible to find this exciting feature, but luckily it is referenced on the supplements disc in the Ultimate Toy Box set.
All easter eggs were generously submitted by SirDonk