On the first disc, choose [Scene Selections] from the [Main Menu]. Go to the last page. Press 3 twice (in some cases you may have to press Enter after each 3). Watch "How Jay Thinks Kevin Directs". On the second disc, choose [Deleted Scenes] from the [Main Menu]. Go to the last page. Press 2 and then 4 (again in some cases you may have to press enter after each number). Watch "How Kevin Directs".
Hidden Trailer
Go to the [Main Menu]. Press [Right] to highlight the heart around Cool Jesus. Select it and watch the trailer for "Good Will Hunting".
Hidden Commercial
When you are viewing the 2nd disc, and you are on the buddy christ, push the [Up] arrow on your dvd remote. This will highlight a small circle on the top left part of the screen. Press [Enter]. You will see a commercial for Jay and Silent Bob's secret stash, a store that sells Jay and Silent Bob memorabilia.