So, you get a +2 to your refresh is your Catch is something that anyone with an awareness of the supernatural would know about, and only +1 if it's something you could uncover with research. Except (and I'm looking at the pdf-version here, since my hard copy has yet to arrive, so things might have changed) the example for a Catch given under Physical Immunity states that a fire demon would get a +3 Catch on its Toughness, with a vulnerability to Cold. +2 because Cold is easy to come by, and +1 because research should uncover it.
Setting aside the fact that I'm having trouble thinking of how to easily assault someone with cold, shouldn't the fact that a fire demon is vulnerable to cold be blindingly obvious? Or at least, obvious to anyone who's ever played a game with elemental vulnerabilities (such people likely outnumber those who've read Bram Stoker at this point)? Does the Catch discount take common sense into account, or is that covered by assessments/declarations?
Same question for, say, a chlorofiend. Giant plant monster; the first reaction of any human being when considering weaknesses would be "fire"... so would it get that +2 for a widely-known weakness, or would I need to "research" it? Basically, is "this creature has a widely-known weakness" the same thing as "this creature's weakness is really obvious"?