At the very end of the credits there is a line that says, "No Dragons were harmed in the making of this movie." But it's a long, long list of credits. Basically every geek who worked on animation, every gopher who brought lunch has their name listed. Too bad noone stays to see those names. But I bet they take all their family and friends to see it and make them sit through until their name appears. :)
No I won't list any real spoilers. I try to be good about that. I do think they handled the teenage dramas very well. It felt very authentic.
After reading the last book I did find myself watching Snape very carefully...