i would think that if there are rights issues with a particular episode, that episode would not be available anywhere? You are right though that a lot of these FAST services do only show certain eps or seasons, but the same is true of the traditional TV marathons. They usually run through the most popular eps, seasons, or story arcs.
You've got me curious now! It was definitely not complete during the CBS All Access Days, but I thought it's complete now? I just watched through a few months ago and it appeared all the eps were there except the Xmas Special (just a flashback ep) and the "lost pilot." What else did I miss? I do wish they would have the Lucy-Desi Comedy Hour on there though.
You are correct on I Love Lucy. Sometime recently they must have added the missing episodes. I checked not long ago and there were still a few missing. Now it is complete. The Brady Bunch is still missing some though. Hopefully this is a good sign that they're trying to put up complete series in the future.
