They could also include a TrekBBS text commentary:
Maxwell Everett: Notice how the DP selected a film stock with a heavier grain for all shots set on Quo'nos.
GalaxyX: There should be ten ships here, but CBS was too cheap, so there's only four. Basterds!
Flake: This moment right here is when the project went terribly awry: CGI Enterprise! And the original shot lost forever.
Random poster-by: Why is this not in 16:9, I heard there is more image on the neg.
Sho: <something about ship windows>