Disk 3
In the menu for "Where No Fan Has Gone Before," highlight Home and move right. The Trekified Planet Express ship will appear. Hitting Enter will play some special commentaries.
Disk 4
In "Spanish Fry" highlight Scene Selection and move left. The pictue of Fry, Bender and Leela will appear. Enter for some unused captions.
In "The Devil's Hands..." move up from Play episode. The aforementioned hands will appear. Enter for a table read.