The DVD offers some interviews with the cast and director, which aren't particularly enlightening (or interesting). And that's about your lot as far as extras.
Not sure what happened in the transfer from the television to DVD, but a lot of the music has changed. I know this seems retentive, but I think it makes a big difference. Britney Spears appears now instead of Alainis Morisette in the pub jukebox. Danny dedicates Brass in Pocket to posh Emma. A mangled version of Jeepster features in one episode. It really spoils it, for me and I've dropped a star because of it.