Okay, now anyone who ventures in here is warned.
GC- they changed the curse from a vague, red-light stunner to an Avada Kedavra curse, and had him die before he even fell through, thereby effectively removing any hope that he may have somehow survived. No need to explain the veil now- he's dead.
One of several plot changes that I am not especially happy with. Another that bothered me was the scene after Harry brings Dudders home- no mention of Aunt Petunia's curious knowledge of wizard stuff, or her prior contact with Dumbledore. ("Remember my last, Petunia!") Still, I liked the movie and will probably see it again tomorrow.