I love it that Holmes's hobby is messing with conspiracy theorists! And I love how casually, and correctly, the episode deflated the whole idea that it's possible for a large group of people to keep a massive secret indefinitely. The whole plot revolved around that impossibility. How refreshing, when so many works of fiction (including the immediately preceding show on CBS) depend on the mythology of vast, all-powerful evil conspiracies, to see a story that so blithely deconstructs the very idea.
On the other end of the credibility spectrum, it's a bit hard to take Gregson's hostility toward Holmes seriously when Holmes is not, you know, under arrest for kidnapping and attempted murder. Realistically, he should be going to jail for a long time for those acts; the fact that he changed his mind about homicide doesn't negate the other crimes he committed. But Gregson's just letting him walk free, so he can't be as angry and judgmental as he was portrayed. It's a necessary contrivance to keep the series going, but it's hard to swallow.
As for putting an episode after the Super Bowl, that's most annoying for someone like me who couldn't care less about football (American or otherwise). There's no telling when the episode will actually begin, and I can't DVR it if there's no fixed starting time. I guess my best bet is On Demand.