Some DVDs of movies have been issued with a commentary track by critics or film historians that are very illuminating. Most commentaries are not. The worst seem to be those that involve the actors, and commentaries by directors are generally not the best ones, and often are worthless.
I have been trying to come up with a list of DVDs (or Blu-rays) that have a commentary track that is able to genuinely open up the film to the viewer and teach a lot about movies and how to watch them. Here is my list so far:
Alex Proyas, Dark City, commentary by Roger Ebert
Michelangelo Antonioni, Blow-up, commentary by Peter Brunette
Claude Chabrol, Les Biches, commentary by Wade Major and F. X. Feeney
Claude Chabrol, Le Boucher, commentary by Howard Rodman and Terry Curtis Fox
Claude Chabrol, La Rupture, commentary by Howard Rodman, Terry Curtis Fox and F. X. Feeney
Claude Chabrol, Une Partie de Plaisir, commentary by Dan Yakir and Ric Menello
Many film noir discs have commentaries by film historians. I have not put together a list of the good ones (and they vary a lot).
What other discs should be on this list?