Don’t laugh, but the commentary on My Cousin Vinny, by the director, I found almost as interesting as the movie (which, I suppose, isn’t saying much if you didn’t like the movie…). One of the few times that I’ve listened, attentively, to a commentary all the way through.
The commentaries on the Stargate SG-1 TV series DVDs are usually interesting, especially when Peter DeLuise is there. He is, frankly, a heckuva lot funnier off-the-cuff than his dad is with a script. James Tichenor, the special effects supervisor, is also good at commentating. The thing I like is that they actually tell you things that you probably don’t know. They talk about how a shot was done, they point out how great the matt painting is in the background, or how “Rick” (Richard Dean Anderson to us) is again playing with the props in the background of the shot, how beautiful Amanda Tapping is (ok, so sometimes they do state the obvious :)) etc. etc.
I recently watched Die Hard 3 and then listened to about half the commentary (stopping only because it was getting very late at night). It was pretty interesting to hear how the script was originally written as a standalone, not related to Die Hard in any way, then got picked up for use in Die Hard 3, what got changed, what didn’t, etc.
For the bottom of the barrel, my nomination is the Dick Van Dyke TV series. It has a few episodes with commentary by Dick and Carl Reiner. They had zero preparation, even saying early on that they hadn’t seen the episode in 30 years. Dick also comments at one point that since they are only watching, not listening (the sound is turned off for them since they’re recording the commentary), he’s not quite sure what’s going on. There are long, long gaps of silence, puctuated with such gems as, “Oh, I remember this episode . . . I wonder what happens next? . . . Oh, I remember what happens next . . .” It’s just blather, there’s no interesting behind the scenes info or anything. After ten minutes, I just had to turn it off. I’ve tried about three of the episodes with commentary, and they’re all just as bad.