To peel back the curtain a bit...
We do have a master matrix of films that was polled by you, our community, from this very thread. The four prime DiF'ers choose which ones they HAVE to be on, are indifferent to, and don't want to be on, which allows regular sub's like myself and Ryan our appearances. Usually Teague sends out an email to whoever is going to be doing commentaries by Wednesday, though sometimes its been a week or two in advance. There is usually some discussion about which two films to watch in a taping. Sometimes its very easy to decide, sometimes it takes some discussion, but usually by Friday everyone knows what and when. Often, Teague will invite people over to his place Friday night to catch up on it.
One time we were going to do the Patriot, because I suggested it and there are some legit awesome scenes in it. Brian, Teague, and I sat down.....and PLODDED through it. We realized how long it was, and how little to say of it we had at the time, and that night pulled a pinch hitter. SO it's not an exact science by any means.
Eddie Doty