I agree with the poster above re: the moment that I turned off the film Dumbledore, the moment Harry's name came out of the GOF. He was angry, but not with Harry, and believed him straight away when he denied his involvement. Gambon seems to play him much too angry, and strangely Irish! I think Richard Harris had him spot on.
I will need convincing on Rhys Ifans playing Xenophilius Lovegood, he is supposed to have white, candy floss like hair isn't he? Older than Rhys Ifans anyway.