I'm going to add a big fat
DITTO to what has been said thus far. I can't believe so many important things were left out of the movie!! Crookshanks, Cedric, and what drove me crazy:
THEY DIDN'T SAY WHY HARRY'S PATRONUS IS A STANG!!!!!!!!!!!! 
PS:The dementors reminded me of the scary black things from
Ghost Ya know, those things that take the bad people to hell? Instead of Patrick Swaze??Those things freak me out.