Beyond Good & Evil
Collect 88 Pearls to enable the Marble mini-game on the Mdisk.
Photograph every animal in the game.
Beat the game and watch the credits. During the credits, don't press any buttons and when the credits end another FMV will start.
Unlock the Beluga:
The codes on the bottom of the Jet Boots unlock the Beluga Spaceship. Simply rotate the boots to see the codes.
Thanks to Revolution reader Kalib, Mopants, and DucatiXR!