Sirius Black: James suggested I made the change permanent. The tail I can live with, but the fleas...they're murder.
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Harry Potter and the Prisoner of Azkaban (2004) - 302 mistakes
Directed by Alfonso Cuarón, starring Alan Rickman, Daniel Radcliffe, David Thewlis, Emma Watson, Gary Oldman, Maggie Smith, Michael Gambon, Robbie Coltrane, Robert Hardy, Rupert Grint, Tom Felton (add more)
Harry's scar does NOT change sides in the boggart scene - various shots in that scene are filmed in a mirror. Also, as with the other films, differences between the book and film aren't movie mistakes.
Continuity: When the ghost comes through the window on his horse we see him riding into the hall before the headless ghost comes through the window and pursues the first ghost. Then it cuts from inside the hall and we see the first ghost come through the door again. By this time it should be the second ghost coming through the door, not the first.
Revealing: When Hermione fakes reading the crystal ball, Trelawney insults her and Hermione knocks the crystal ball off the table. As the crystal ball leaves its stand it turns over and the tube used to create the smoke effect inside the ball is visible. Then as the ball rolls toward the stairs, there are no tubes visible.
Continuity: When Harry arrives at Lupin's office the tall dark ornate chair sits directly in front of the corner of Lupin's desk, with one of its chair legs right beside the desk leg. However, in the wide shot when Lupin explains that he resigned, the chair is much further away. Then after Lupin leaves, when Harry walks towards the door, the chair is beside the desk again.