This is why I like the commentaries on DVDs so much; you get a mini-education (sometimes better than others) on how a particular film was made.
For example, on the DVD of Carpenter's "In the Mouth of Madness," the commentary was Carpenter and (iirc) Gerry Kibbe, the Cinematographer. Every scene was discussed in terms of lighting, which was interesting at least initially.
Of course, some are just "oh, I just love this scene" and "isn't that beautiful they way
- did that," but overall, I find the commentaries very interesting.
One I absolutely did not like, and turned off, was the commentary for "The Day After Tomorrow." The first 'bad word' (hey, I watch these things with my daughter in the room, and I don't particularly want her picking up certain language) I cringed and just thought, "okay, the guy's making a point." But a couple of minutes later, he said another, and that was it. Okay, so the film itself was PG-13, but I don't think there was that much cussin' in it; the commentary was 'hotter' that the film itself, and to me, that's just dumb.
Anyway, a DVD showing lighting/photography, sound, editing, post production and may CGI would be VERY interesting.