Deliberate mistake: When Harry drops the Monster Book of Monsters, in the first shot facing Harry's feet as the book chomps at him, he runs backwards a few steps and he stands at the foot of the bed. However, in the shot facing the fireplace, there is actually plenty of floorspace now, much more than other shots, between the rug and bed for Harry to continue to run backwards. (00:15:15)
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.
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