Yikes, with all the clips that're out on the internet, you can basically watch the entire movie >_> forget the thrill of seeing the movie in theaters. Hmph. I'm remaining unspoiled -- all the spoilers I could ever want are in the book.
And an important thing to remember with any movie (especially a movie based on a book/book series) is that the director is showing you his image of everything. It won't be perfect, and it will probably not be what you want -- it'll be whatever he's trying to show you. It took me three movies to understand this, especially since PoA felt like watching a Cliff's Notes version of the book... but I promise, you'll enjoy Goblet a lot more if you go in with an open mind, rather than sitting down with the intention of picking out every detail the director gets wrong.
*packs up her soap box* Okay, I'm done. And who wants to cut Harry's hair? It finally looks unkempt and shaggy and flattering to Radcliffe's face structure...
translation: his haircut looks niiiiiiice...