Go to special features. Highlight anything and press right. It would then highlight Jet Li's kneepad. Press enter and you will see a "Time Lapse Montage" featurette.
Rear Projection" featurette
Go to special features, higlight additional special features and press enter. When you're there, highlight anything and press right. This will highlight Gabrielle Union's necklace. Press enter and you will see a "Rear Projection" featurette
All easter eggs were generously submitted by Bjorn_K