DOCUMENTARY
Insert Disc 2, and select the Bonus Materials option at the Main Menu.
Advance to the second screen, then select the Egyptology 201 option.
Select the An In-Depth Look At Mummification option.
Highlight the arrow at the right side of the screen, then press Right to highlight the scorpion symbol.
Press Enter to watch a documentary about mummification.

HIDDEN TRAILER
Go to the Special Features, then select the Music Video.
When the video is playing, press Skip Forward to the next chapter and you find a hidden trailer for The Mummy Returns Soundtrack, which is not mentioned on the special features list.

CREDITS
Insert Disc 2, and select the Bonus Materials option at the Main Menu.
Advance to the second screen, then select the Menu option at the bottom.
Press Up to highlight the hieroglyphics.
Press Enter to view the disc's production credits