I was also not as impressed with this one as I hoped. Staging was beatuiful, Womping willow was great, but it got more face time then my beloved Rickman! Also, it seemed more like a series of vignettes loosley put together then an entire movie with a unifying narrative.
And Mrs. Norris (the cat) didn't have orange eyes! That jumped out immediately.
I didn't like that they left out the explanation of the map, All I wanted was for Harry to ask "how do you know this is a map?" I mean really, if Snape couldn't tell how come it was accepted that Lupin could?
And Thewlis was good, although having been scarred for life by being forced to watch "NAKED" he creeped me out, I kept waiting for him to tell Hermione to whip him with her hair.