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Commentaries:
In the episode "Marge vs The Monorail" Disc 3 there are 2 commentaries available. One with Writers, Producers + writer Conan O' Brien. The second is an audio Commentary with just the normal panel featured in other seasons of The Simpsons. In order to hear theses commentaries Switch the audio to the commentaries with remote control

Production Art:
On Disc 3, Hidden sketches of Homer can be accessed by entering "240" on the remote in the "Extras" menu of "Homer's Triple Bypass" and clicking on the pencil that appears.
Reported by: John Winchester

Production Art:
On Disc 4, Hidden sketches of Krusty can be accessed by entering "35" on the remote in the "Extras" menu of "Krusty Gets Kancelled" and clicking on the pencil that appears.
Reported by: John Winchester