I've been watching the special edition season series for a couple months now. Wow is it incredible. Not only is it amazing watching all the episodes again and catching all the small details they put in, but the director commentary is so informative.
For example,
I also had NO idea that Bob Odenkirk (Saul Goodman) was the writer of Chris Farley's infamous "Van Down by the River" SNL sketch. So many cool details in the commentary that fans of the show will love.