Harry learns that Peter Pettigrew was the real Secret-Keeper and that Sirius Black was framed. Scabbers is actually Pettigrew in Animagus form. Harry and Hermione helped Black to escape just as he's about to be given the Dementor's Kiss. Snape was furious about that so he let slip that Lupin is a werewolf and resigns as Defense Against the Dark Arts teacher.
Continuity mistake: When Malfoy and his friends bother Ron and Hermione, Harry shows up and messes with the three boys. He grabs hold of Malfoy's feet, lifts them in the air and pulls him across the snow. In the first close-up of the soles of Malfoy's boots, not a speck of snow is on them, though he was just walking in it. Then in the next close-up, his feet still in the air, the soles are now covered in snow. (01:02:45)Super Grover
Trivia: In order to acquaint himself with his three lead actors, director Alfonso Cuaron had each of them write an essay about their characters, from a first-person point of view. Emma Watson, in true Hermione fashion, went a little overboard and wrote an 16-page essay, Daniel Radcliffe wrote a simple one page paper, and Rupert Grint never even turned his in, as he said that is what Ron would have done.
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