This movie is going to throw off my impression of Dumbledore, since I read the 5 books with Richard Harriss' voice in my head whenever it was Dumbledore dialogue.
As for Lupin, I imagined him with longer hair than seen in the trailer. (He was also illustrated with longer hair in the 5th book). But that wont bother me too much so long as he acts like Lupin.
The kids acting didn't bother me at all. But then I guess I never really notice a "bad" acting job because I'm never looking for one. However, I will notice an actor doing an abysmal job, like Hayden Christiansen... he just didnt have the Darth Vader confidence in his voice... but theres been many threads about that before.
One scene I hope they dont mess with, or mess up, is Trelawney's prediction. I imagined her making that predicion with a voice that would shock the hell out of anyone... and I hope they use a voice that makes people jump out of their seats in the theare... like a low, dark, but loud satanic sort of voice. A voice that would convince people that this is not for 8 year olds.
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"Guns don't kill people, I kill people."