I didn't read the seventh book, and as the series went on I felt that it needed an editor. It was...
Okay, first few books are a bit comical, a bit farcical. Hagrid's feet being like baby dolphins, the descriptions of the Dursleys. Almost cartoony. Then the books get darker, they grow up, things become more realistic in a slowly dawning fashion. That is one of the huge strengths of the books to be honest, but Rowling continued to use the farcical descriptions and it was rather jarring.
The whole moral myopia thing, and the always chaotic evil with all the slytherins not helping Hogwarts.
Severus Snape, from the ending it's apparent what kind of character she intended him to come across as, instead it's very possible to get creeper vibes off of him. Lily, also, seems to be intended to be a good person, instead I found myself not liking her much.
JKR is good people, though. Great people, actually. So I don't think it was intentional, I think she just got a bit lost in her own work--keeping track of it all is hard! So it all could have been solved by someone going, "Uh, Jo..." But she really didn't have that person.
The new movie: I am vaguely disconcerted by how white the city looks in the previews. I'm really hopeful we will get to see Wizards befuddled by the casual color based racisim back then, hell, even the anti Irish sentiment, and then turn around and not blink an eye at anti-muggleborn sentiment. (While the enlightened heroes go, "that's right rotton, behaving like that to muggleborns, t's no better than those muggles over there.")