“The final battle with Harry and Voldemort is a millions time better in the book. They get to have it out in front of everyone, and Harry gets to call out Tom and basically takes him apart verbally, and so many people get to see him die a ‘normal’ death, so there are plenty of witnesses who see he’s actually dead this time. In the movie, it’s just the two of them, and Voldy turns to dust and floats away, but no one gets to see it. Why would anyone believe he was finally, truly gone?!”

—Michelle

Source: https://www.buzzfeed.com/noradominick/best-and-worst-book-adaptation-added-storylines