Seriously, fansubbers should stop with the reference notes completely. References don't suddenly become funny with an explanation, and if you'd actually get it, the reference is ruined by having the explanation there, so you don't even get the change of having a "Ha! I know where this is from!"-moment.
Or at least put all the references as a separate text file or something, that way they won't be in the episode all over the screen fagging things up.