Go to the Family Tree on the bonus materials disc and press up until it makes a portrait turn white. Then click on that and it'll give you a brief history of the actor/actress.

I also found something else when i was watching the behind the scenes disc and its this brief clip from the Sopranos made for the box set.
In order to access this go to DVD Credits and then click "Next". Once you get to about the third page of credits the "Previous" Button will automatically be hilighted. Put it on "Next" and you can view the clip. I'm not sure if anyone already reported this, but i thought i'd mention it.