Turisu said:

Again, I implore you not to touch the grain or at least make an alternate version of your release with the grain intact.

Yeah, I gotta agree about leaving the grain intact. Grain doesn't bother me in the least. I've been enjoying some great 70's films lately on blu-ray, and those older films have a very distinct look to them, often owing a lot of that look to the type of film used, and the grain visible throughout the film. Nothing bothers me more with a blu-ray release than when they apply DNR and scrub the grain away, along with a good amount of detail. In fact, I skipped out on Weird Science on Blu-ray because they DNR'd it to death. So yeah, I think the grain is vital to the look of these films and shows. If some episodes are grainier than others, then that's likely how they were shot - perhaps different film stock was used at times.