Easter egg: In the special features under the "Philosophy of Time Travel Book" in scroll through until you see a man with a target around him. Press the up button and the target is highlighted. Press enter.
Easter egg: Region 2, disc 2 of The Mummy Returns there is a 'mummification featurette'. To get to it you must highlight and enter Egyptology 201, then enter 'In depth Look at Mummification' section and press right twice to highlight a scorpion. Press enter to see the featurette.