Simpsons: Season 6 Easter Egg - 2 Eeggs for the Price of One

A drawing of the Simpsons' house made out of squirrels (a cut scene from "Treehouse of Horror V") can be accessed by highlighting the 'Play All Deleted Scenes With Commentary' option from the Extras menu of Disc 4, pressing Right, and selecting the pencil icon.

If you watch the episode "Fear of Flying" with the audio commentary, after the episode is complete there is a short memorial for guest star Anne Bancroft, who died just before the boxset was released, by David Mirkin.