When the Order arrives to Harry’s house with the intent to get him out of there alive, they use Polyjuice potion to disguise themselves as him. In the book, Harry gives his hair for the potion willingly, while in the movie, Hermione plucks it from his head when he is not paying attention.
When they fly off with their brooms, they get attacked by Death Eaters and Voldemort. In the book, Hedwig is with Harry from the beginning and is killed by a stray curse. In the movie, however, she is freely flying around and sacrifices herself to block the curse that was heading in Harry’s direction.
When our trio arrives to the Ministry in order to steal the locket from Delores Umbridge, they see that she has Mad Eye Moody’s magical eye in her door. It was taken after he died in the initial attack. In the book, Harry steals the eye back, but in the movie this does not happen.
They share the locket they stole, because it makes the person wearing it evil. When it is Harry’s time to wear it one night, he notices a deer patronus in the woods, who shows him where the sword of Gryffindor lies. Because it was in the water, under the ice, Harry had to jump in to grab it, but forgot to take off the locket. In the book, it strangles him into unconsciousness and when he wakes up, Ron is standing there with the sword. In the movie, Harry does not pass out and he sees Ron grab the sword.
Voldemort was on the hunt for the Elder Wand, the most powerful wand in existence. In the book, he tortured Grindelwald for information about it and killed him after he was done. In the movie, Grindelwald is not murdered, he just tells Voldemort that the wand lies with Dumbledore and Voldemort disappears right after.
In the book, it is said that there is a Taboo charm, that will let Death Eaters know when the word “Voldemort” is used and where. This information was not given in the movie. When the snatchers catch our heroes it is Fenrir Greyback that leads them and they arrive there because of the Taboo. In the movie, where we do not know about the Taboo, Scabior is in charge of the snatchers and they catch them by mistake, as they apparate to their location by accident.
After they are caught, in the book, Hermione is taken for interrogation and is tortured with the Cruciatus curse. In the movie, she is also tortured, but is also whipped and they carve the word Mudblood in her arm.
In the book, when they are trying to escape, Wormtail is trying to kill Harry. Harry reminds him how he once saved his life. Wormtail hesitates and the silver hand that Voldemort gave him, turns on him and strangles him to death. In the movie, Dobby casts a spell that hits him. We do not know if it did in fact kill him, but we never see him again.
At the end of the movie, our free and beloved elf Dobby, is killed. Before he dies, he has a short conversation with Harry and thanks him for being his friend. In the book, Dobby was only able to say Harry’s name, before closing his eyes forever.
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