An Easter Egg is a hidden feature on a DVD
In the menu on disc six of the DVD box set, two easter eggs where hidden, one in which Eric Kripke talks to the fans about Season 2 and fan support, and another showing two openers for Supernatural instead of the brief title card that is used. To get to the easter eggs, one must navigate over the images at the side of the menu - the entrance to the easter eggs is activated when a) the door of the house lights up and b) Dean's eyes start to glow.
To find the behind the scenes feature go to special features on disc 6 click on the devil's road map then click on the left side of the map it will zoom in then your going to click on the number 22 it will start and show you the making and all the problems they faced.
Go to "The Mythologies of Supernatural: From Heaven to Hell" featurette in the Special Features section. In Heaven (Paradiso): Scroll up and highlight "Angels and Archangels". Hit the right arrow. The clouds will be highlighted. Hit enter and Part I of Ghostfacers web video from "It's a Terrible Life" will play.
In Purgatory (Purgatorio): Highlight "The Bonds of Limbo" then hit the left arrow. The doorway will be highlighted. Hit enter and see the Ghostfacers testing their safety goggles. Highlight "Menu" then hit the left arrow, another doorway will be highlighted. Hit enter and learn GMA (Ghost Martial Arts) from the Ghostfacers.
In Hell (Inferno): Highlight "The Sweet Song of Death" and hit the right button. A bar (or something that I can't distinguish) will be highlighted. Hit enter and Part II of the Ghostfacers web video from "It's a Terrible Life" will play.
On the episode menu, hover over 6.18 Frontierland, click the right directional and a pair of scissors will appear. Click on these for a deleted scene from the episode.