There's nothing you can do as a DM to ensure that people care as much as you do about the world you've created other than to relax and realize that it's all vanity. They're going to refer to major villains as "that guy," they're going to mix up the races of their characters' adoptive parents, and they might even forget the names of their characters' gods. Maybe with time and exposure to your world that'll change, or maybe it wont. That wouldn't be a tragedy and it shouldn't get you worked up.