Here's an idea I just had: tag posts with "s#" (like s3 or s7) when referring to a particular season. That way we can easily find all posts pertaining to that season using the tags feature. And "s" is quicker to type out than "season".
I just did this when tagging my B.A.S post referencing season 3.
l think it would be helpful except, since l don't own the whole series, l may be able to talk about a particular ep or scene, but l'm not sure l could name the season it's from without going on a search.