Yes, I did watch the show. I first saw it, in fact, months ago when it was initially aired. You could still sense the disappointment in Mercein's voice. I don't blame him.
Mercein was playing extremely well in '66 before being injured. Cutting him at the end of training camp in '67 wasn't justified, and the fact no team picked him up on waivers shows that there was a budding Caste System even then.
Travis Williams was never a true RB. He shone as a kick returner (although that was primarily in one spectacular season). Anderson and Grabowski were college stars, and true every down backs. Wilson shouldn't have seen time at the expense of any of them, including Mercein.
I used to worship Lombardi, and still enjoy watching old clips of him and his teams. However, while his offense was nearly all white (only black starter TE Fleming), his defense had more black starters (6) than white, which was a real rarity then. Even in the early '70s, the Dolphins still only had one black starter on defense, by contrast.
I believe that Travis Williams and Lionel Aldridge both had "character" issues when Lombardi signed them. Later, I think Dave Hampton had them, too. I wish I were wrong, but I have a hunch that he was trending towards the "new" look in the NFL at the end of his career. He had nothing but black RBs in his season at Washington (his training camp was so grueling that Bob Brunet quit the team).
I think most unbiased observers will watch that program and come away from the Mercein comments feeling the same way I do.