Secrets of the DVD

My DVD player remembers the last place I stopped on almost all my DVDs. So when I threw in the B5 Lost Tales it found the Dini interview on the Superman: Doomsday DVD... which is were I left it off. Which means that the B5 DVD is also encoded with the Superman: Doomsday DVD. I assume this is common and that manufacturers have soom way to "switch" on one feature or the other, then stamp and ship.

Anyone know how to access all the stuff encoded on a DVD?