I didn't mean 15-20 minutes just on that, I meant overall. The cat and rat part was big, Crookshanks near something was wrong with Scabbers, they had maybe two very brief throw away lines about it. Also there was the communication between Crookshanks and Sirius. The trial of Buckbeak was another thing, towards the begining of the Hogwarts scenes Draco gets attacked, then it isn't touched upon again until the end of the book, both these plot points had a great deal to do with the ending.
They didn't explain the origins of the map to Harry in the movie, they left out so much of the scene and in a great director's hand that scene would've been paced out fine and I do think Cuaron could've done it. It would've been so easy, don't make it all dialouge, make it a flashback montage sequences so it's not just a bunch of people talking in a room together. We weren't even told what Harry's father turned into or about thier nicknames.
Apparation is supposed to be people just appearing, clouds of smoke gives you warning. It actually should be like Fred and George do at the beginning of the movie, why the inconsistency within the same movie? Why do Fred and George want to suddenly appear, but the Death Eaters and Order semm to want to "announce" that their coming.
Yeah I haven't seen the movie and I hope I'm wrong, but nothing tells me I will be, in the last two movies the most important parts were cut for either action or teen romance. I focus on the important parts that were cut. I've never complained about the lack of Dobby or SPEW, I just said I'd have been fine with the Lavender and Ron or Ginny and Harry subplots cut. What I want is a scene discussing what happened when Harry and Voldemort's wands met, which was cut and plays an huge role in Deathly Hallows or Harry's discussion with Dumbledore at the end of Order of the Phoenix, again cut down to a few seconds or what we already know, the full origins of Voldemort, which are only given two scenes in this movie. How about showing the trial for Neville's parents or the condition of Neville's parents in one of the last two movies, which tells you why he wants to fight so much. Cut SPEW, cut the Yule Ball, cut Quittich, cut Grawp, keep what's important, which started slightly with Cuaron and has gotten a lot worse in the last two movies.