HP6 movie different from the book~how?

There are a number of changes from the book in the film. Much of the book's ending has been changed, with the climactic battle and Dumbledore's funeral being removed. Heyman commented that the end battle was removed to "[avoid] repetition" with the forthcoming adaptation of Deathly Hallows. The funeral was removed as it was believed it did not fit with the rest of the film. The collapse of a Muggle bridge mentioned briefly in the book serves as the film's opening sequence. Scenes of Diagon Alley being demolished by Death Eaters and an attack on the Burrow by Bellatrix Lestrange and werewolf Fenrir Greyback are added, as can be seen in the trailers. All but two of the memory scenes, including that of the Gaunts, have been cut. Only the flashbacks of Tom Riddle at the orphanage and Riddle asking Slughorn about Horcruxes, shown twice, remain. Yates said they made the decision to compress the memories, but still "got some really cool ones". Characters who are cut include the Dursleys, Kreacher, Dobby, Bill and Fleur, Rufus Scrimgeour, and the Muggle Prime Minister. However,Quidditch being excluded from the previous film, returns. Bellatrix Lestrange will also participate in the battle of the astronomy tower, whereas she did not in the book, as seen in a picture with the Carrows and Greyback, celebrating Dumbledore's death. In the book, on the Hogwarts Express, after he is petrified and hidden under his Invisibility Cloak by Malfoy, Harry is rescued by Nymphadora Tonks. In the film, Luna Lovegood saves him instead, using her Spectrespecs to find him.