I watched this with my wife tonight and she couldn't understand why they would choose to live in a mobile home in the desert if they were the last people alive and could live anywhere they wanted. I said it was his home and he had all his stuff there. Also, whatever killed everyone might be more prevalent in the cities and the cities would reek of death. Your average home might have at least 3 or 4 bodies decaying in them which would leave most neighborhoods smelling pretty bad. And water and electrical services would tend to stop fairly soon after the collapse. But we all know that it was an inexpensive set and being out there, you didn't have to worry about people stumbling on to the set or planes flying by. I enjoy these kinds of movies with Vincent Prices' THE LAST MAN ON THE EARTH, and ON THE BEACH being dismal masterpieces about the end of civilization as we know it.
THE LAST MAN is more light-hearted than most of these types of films and the psychology here is good and believable, though the effects of being the last man are far better shown in the aforementioned films. This was a fun and intellectual waste of ninety minutes and better than most of the mindless drivel on t.v. like Big Brother, Blind Date and other crap programming that seems all the rage these days.