I recently dug up some bonus material from Silver Lincoln and Variations on the Death of Gerald, consisting of deleted scenes and prank cuts (cuts of the film that are deliberately terrible that we show to friends and peers, passing it off as the real thing. The look on their faces afterward as they attempt to think of constructive criticism is priceless).
I also dug deep and found some old animations from my stop-motion days:
Way cool. They're up on the Archive's new Animation section.