Commentary tracks on the Leverage DVD sets. John Rogers basically decided to make them showrunning master classes. And there's a commentary on every episode.

Followed by the commentary tracks on the 1980s Twilight Zone S1-S2 sets (S3 was a different crew with a different showrunner when the production moved to Canada). My only sadness is that they didn't get GRRM to comment on his episodes so we could hear the story of how the stuntman lost his nose on his adaptation of Zelazny's "Last Defender of Camelot". (I once asked him if that might be why Tyrion loses half his nose in the Battle of the Blackwater (in the books, not the show), and he grinned at me and said, "You might be right about that...")

But the Harlan Ellison commentaries are cherce and solo (he also badmouths Danny Kaye in "Paladin of the Lost Hour", which is fun), while all the other ones are group commentaries. My fave is the one on my favorite episode: "Her Pilgrim Soul" where Philip DeGuere (showrunner) and Wes Craven (director) hear how Alan Brennert came up with the plot [>!it's a ghost story, and Brennert's then-partner had died at the age of 25 of leukemia, and he heard her voice saying "I left you too soon, my darling."!<] and they go, "Man, if that was my connection with the story, I'd never be able to watch it!" Also the part where they admit to being two middle-aged men in tears on a re-view before doing the commentary.