BTW, looking at that:
Did they go back to Utah? I would think some scenes have to take place there, but it doesn't indicate if they were filmed back then or if they had to film them later
It would've made been far more economical to do everything there at once, if at all possible (and given how timey-wimey this particular plot is, I wouldn't be surprised if a lot of the finale was written well in advance). Also, some people saw some footage either from a Confidential or a BBCA making-of special for the first episode which showed them filming a scene that appeared to be from the last episode (or, at the very least, wasn't in the final cut of the premiere).