Hidden Storyboards
On the [Main Menu], [Up] arrow from the [Play Movie] entry. Click on the paw print to see some storyboards.
Bonus Footage
Go to [Special Features] and highlight another paw roughly in the same area of the screen. Click on it to see some rehearsal footage.
Hidden Reviews (REGION 2 ONLY)
On the [Main Menu] screen, move to the scene index and push [Up]. A female symbol will appear. Press [Enter] and then follow the instructions.