I just noticed something re-watching S1E2 that might be related to McAllister. This is the first episode that we see McAllister. I haven't seen this being brought up by anyone else before, so I thought I'd post it here.

When Jane is talking to the landlord who owns the motel. She told Jane that there are "special discounts for federal and state employees". I don't see why BH would have added this line for no reason. There's a chance that McAllister was paying for the room (or maybe even the other officer who Jane seemed to be eyeing very closely). I know it's wild guess, but McAllister was in all the right places that episode, and I find it hard to believe that it was all a coincidence. I'm not saying this links McAllister to being Red John, but I think it's a strange coincident.