You mean the bit about R/Hr actually being canon? Well, that was obvious from the book alone, wasn't it? :)

Speaking of which, you may have seen people here and there complaining about that bit with Hermione Confunding whatshisface to get Ron the place on the Quidditch team, but speaking for myself, I liked that bit, because it showed how Hermione (who was always such a stickler for rules) is actually "loosening up" because of Ron, which I always thought was something she needs.