To find these special secret hidden deleted scenes, go to the separate episode menus (press the + next to play) for the following episodes;

* "You Only Move Twice"
* "The Twisted World of Marge Simpson"
* "Mountain of Madness"
* "The Itchy & Scratchy & Poochie Show"
* "The Old Man and the Lisa"
* "Homer's Enemy"

There should be a light on the speaker to the left of the screen. Press left as soon as you get to the extra menu. It should highlight the light. Press OK.