Easter egg: On the second disc of the Double Disc edition of the DVD there is a Special Features menu listing about eight programs. If you press left from any of these the cursor moves onto a hidden box, giving you about eight more features to watch.
Easter egg: On the first page of the "special features" menu, you will notice a blank space in the middle between "more" and "main menu" on the very bottom of the page. If you got to the main menu button and then go once to the left, a series of numbers like the ones Ben Kingsley draws in the movie will appear where that blank space is. If you select it, it is a short interview with a Taoist master about the "third eye" principle.
Easter egg: When accessing the directors' commentary, press right and you will find a 2nd commentary by different people.
Easter egg: On the 2nd disc, if you go to dissection then hit the down arrow then the right arrow, it will tell you the story of Billy the puppet.
Easter egg: While in the extra features menu navigate through the options until the white star is highlighted. Click on this to reveal a hidden extra with Vince Vaughn.
Easter egg: Go to the commentary menu on Disc 1, highlight Off for the second commentary, and hit right, then up. A yellow spider should appear. Hit enter to see a funny introduction with the director.