Harry Potter and the Deathly Hallows download the new version

McGonagall gives Seamus Finnigan permission to blow up the Hogwarts bridge in the movie when the Death Eaters step on it in the final battle. In the Harry Potter movies, there's a recurring gag that Seamus Finnigan accidentally sets things (or himself) on fire. The Battle of Hogwarts movie changes it to Harry convincing Helena to tell him where the diadem is because he wants to destroy it.

Centuries later, a charming student named Tom Riddle convinced Helena to give him the location of the diadem and later, Harry figures out the diadem must be in the Room of Requirement. Helena hid the diadem in a forest, and when she refused the Baron's advances, he killed Helena, then killed himself out of guilt. When her mother was fatally ill, she wanted to see her one last time, so she sent the Bloody Baron (before he was a Hogwarts ghost) to get her. In the book, Helena explains to Harry that she stole the diadem from her mother, Rowena Ravenclaw. The movie also changed and streamlined the story of the diadem itself. In the film, it's Luna Lovegood (Evanna Lynch) who both thinks of the diadem and points Harry toward the Gray Lady. In the book, Harry realizes it's the diadem through a telepathic moment with Voldemort, then finds the Gray Lady (Helena Ravenclaw's ghost) via Nearly Headless Nick. These are the Ravenclaw diadem, Nagini, and himself (which he doesn't realize until later).

While everyone else is preparing for battle, Harry must find Voldemort's last Horcruxes and destroy them before he can fight him.

Harry Potter and the Deathly Hallows download the new version