3. Close to the end our surviving characters mention traveling to a nearby Russian base, little to no mention is made of the American one that is either just as far away if not closer. (At one point it's said the Russian base is 50-miles away from the Norwegian one, in the original the Norwegian base is a one-hour helicopter ride away from the American base. It's possible the Russian base is closer to the Norwegian one if only by a bit, but it seemed odd little to no mention is made of the American base.
I thought the same thing. Since the Carter character was already infected when he suggested the Russian camp, he could have just been making it up to take Kate over.
Or, maybe the writers took some artistic freedom just to set things up for a possibe sequel. Maybe Kate, McGready, and Childs some how find each other and they make their way to the Russian camp.