The commentaries that you're thinking of are probably in the form of the interviews at the end of discs 2-4. Because of the introduction by AMI on the first disc, the interview at the end was left off. So check out those interviews for the commentaries that you're thinking of.
If you're thinking of commentaries in the sense of a commentary today, where the person watches the program and then talks about it, which you hear while watching the episode or movie, I don't think those exist on any DS DVD.