Easter egg: Go to the Bonus Features menu and scroll down to DVD-ROM. If you click LEFT, a football icon should be highlighted. Press ENTER to view a special thanks featurette from director Peter Berg.
Easter egg: Go to the "special features" section and at the bottom towards the right is the Purple Cobras logo. Click on it and an overweight White Goodman appears, telling you the Easter Egg is to hit enter every time his character snaps his fingers during the movie. (00:21:40 - 01:02:15)