Didn't Battlestar Galactica basically do all those audio commentaries at the time? For online purposes? Doctor Who (2005-2010) did much the same thing, with a repeat TV screening getting a three-handed discussion to listen to via BBCi red button. Those would just get transferred to DVD.
True - those were bad examples. A better one would be Stargate
- all of the SG1 DVDs have commentaries on every episode as well, from season 4 onwards; Atlantis
doesn't have it on all of them, but by my count 92 out of 100 did. (Don't own Universe
Also The Simpsons
do the same, I believe.
Another example would be The Twilight Zone
, which has commentaries for nearly every episode (and many episodes have multiple commentaries).