Yeah, I've run into the fandom issue as well. For me it depended on how it was being used. In cases where I was just using a quick fandom example, almost as an aside, I wouldn't tag for it. But if I was, say, comparing two scenes of two different shows in a more lengthy example, then I would. I'd also use Fandom-Fandom, to if I was discussing things fans do.

I've also tagged for specific episodes a few times, but that was mostly when the comparisons were the main part of the discussion.