Easter egg: Access the Cast & Crew page from the Special Features menu, when the cursor is selected on the Features button, bottom right, press left to select a strange missile looking button. This opens a page that gives a password for accessing parts of the Three Kings website.
Easter egg: On the Collector's Edition Series DVD, go to the Bonus Material menu. Click on the More button, then scroll down to highlight the brown box and press Enter. M. Night Shyamalan will show you a clip of another horror movie he made.