Long before reading/betaing RPS, I was a bit of a canon whore for actors. For example, I do alcohol geeking: I consider it am important part of my fannish geeking to know (to the best of my ability) what a favorite actor likes to drink. Peter Wingfield pimps Brain's Dark (a Welsh beer). Viggo Mortensen likes Carlsbad beer, and every reference to his hard alcohol tastes (one of his photographs and a scene in G.I.Jane) is to Jameson's.

And, yes, I did talk a writer out of having Viggo drink single malt for just that geeky reason. I am all for using whatever knowledge you can glean from publicly published fora.