I’m annoyed that they didn’t alter the Half Blood Prince thing since they already changed things. They could simply not mention it until when Potter throws spells at Snape, and they could have Snape say something revealing that he is the Half Blood Prince. Potter could then tell Hermione who would puzzle it over and wonder out loud why the Death Eaters would pall around with a half blood anything since they are so fond of pure bloods. Harry could then remember seeing it in the awesome potion book. Then the movie could end on “what on earth is up with Snape?”