I gather that John Ruth's driver O.B. is not considered one of the "hateful eight," but he is present for all of the film's events and seems as much a part of the story as any of the others.
I like the rhyming title, but I was confused during the film about who the eight were when there were clearly nine people present at Minnie's, at least until folks start dying and
another character comes out of his hiding place.