As always, I'm confused

I never seem to know what's going on around me, even though I think I'm paying attention... Anyone willing to explain this DVD commentary meme or whatever it is going around? I'm not sure I'm getting it -- and possibly I'm more confused because the two I've looked at were wildly different. Is it just that people are commenting on the writing process of their own stories? Or am I missing something? (Not that I think anyone's asking for me, it's just that I have this weird, insatiable need to *know*. Even after a year plus, I still am mostly mystified by the goings on in LJ-land, I guess.)

( cut for TMI personal stuff )

Oh well... a little sunshine peeking through the gray today (or trying to; there is no place more depressing in January than Seattle), and tons of chickadees and bushtits and house sparrows and robins in my backyard. And the daphne is starting to bloom.