Quite a lot that I know about writing, TV and film-making I have learnt from listening to commentaries on DVDs. I presume other people do this as well: an enormous wealth of useful information is available on the secondary audio track.
Alas, there is a lot of dross as well: I remember one, on a Fawlty Towers disc I believe, that consists of pretty much nothing but the director saying "This is a mid shot..." then "...and this is a long shot..." then "...and we're back to a mid shot now" for six times thirty minutes! And this is why I'm very excited about the forthcoming Fawlty re-release where John Cleese is commenting on every single episode. My wife does not understand this: she just thinks I'm buying stuff again that I already own, for the sake of hearing someone waffle over the action. Which is not even slightly true, obviously. Obviously.
In order that some of the dross be avoided, and that perhaps people can better explain purchases to their wives, husbands or partners (or at any rate just blame me), here are a couple of recommendations. One of the first and best I ever heard was Robert Rodriguez's talk track on El Mariachi, which is a veritable masterclass on getting the most out of a 'low-to-no' budget.Another good pick is the first and second series sets of Father Ted, on each episode of which Graham Linehan details the writing process, explains why some things work and some things don't, picks holes, mercilessly slags off his own work in the Christmas special. At one point, he even starts explaining how he's going to make the commentaries on future episodes work better. He is incapable of opening his mouth without being informative and entertaining, and it's worth the weight of any comedy-writing workshop, trust me.
My latest commentary hero is Stephen Gallagher. As long-term readers and friends will know, I am a true Who geek. I buy all the Doctor Who DVDs as they come out, and watch and listen to all the extras. Whatever you think of the stories, Peter Davison's tend to have the best commentaries. Peter is always prepared, and always informative, but usually quite tongue in cheek too. It's a good mix. But on recent release Terminus (currently only available in a box set called the 'Black Guardian Trilogy') Stephen G bests him in both trivia and jokes. I would almost go as far as to recommend it even if you don't like Doctor Who (your wives, husbands or partners would love that, I'm sure). He really is that brilliant, and keeps a nifty blog too - check out Hauling Like a Brooligan, if you haven't already (and why would you not have, hmm?!).
And if anyone has any other recommendations of informative and/or entertaining DVD commentaries (film or TV), they'll be gratefully received at the usual address. Cheers.