What can I add?
No, seriously. What can I add. It's a some dude in front of a fire and a belching drunk dragon. What am I supposed to say about this?
Wait... OOH! Okay, actually? The premise of Dragonliver is SLIGHTLY more realistic than Dragonheart, at least as far as transplants go. While there are all sorts of very serious risks involved, a person who is still living can donate a portion of their own liver to someone else, and both people will wind up with functioning, nearly whole livers (as far as I understand it, anway).
Granted, there's a whole lot that doesn't explain, but whatever. I think that's neato.
Commentary added for December 31, 2014