Character mistake: When Arthur Weasley takes Harry aside in The Leaky Cauldron to warn him about Sirius Black, he says, "13 years ago, when you stopped.... You-Know-Who...Black lost everything." Harry is 13 yrs. old in Prisoner of Azkaban and was a 1 yr. old when he stopped Voldemort. Hence, Harry stopped Voldemort 12 yrs. ago, and not 13! Harry turns 11 just before school starts in Philosopher's Stone, turns 12 before school in Chamber of Secrets and turns 13 yrs. old before school in Prisoner of Azkaban. Just an aside, the last digit of Harry's age always coincides with Harry's year at Hogwarts. So, he's 13 in his 3rd year at Hogwarts, which is entitled Prisoner of Azkaban. (00:17:50)

Harry Potter and the Prisoner of Azkaban (2004)
1 character mistake - chronological order
Directed by: Alfonso Cuaron
Starring: Gary Oldman, Maggie Smith, Alan Rickman, Michael Gambon, David Thewlis, Daniel Radcliffe, Emma Watson, Robbie Coltrane, Tom Felton, Rupert Grint, Richard Griffiths, Robert Hardy
Genres: Adventure, Family, Fantasy, Harry Potter
Visible crew/equipment: At dinner, just after Harry takes the plate from Petunia and as Aunt Marge says, "A bit more," referring to the brandy Vernon pours, in the left glass door of the hutch behind Vernon, there is a nice clear reflection of a crew member lowering his white sleeved arm off screen. (00:02:40)
Question: Why does Dumbledore purposely hit Ron's injured leg?
Answer: Ron had previously bragged to Hermione about how bad his leg was injured, and had lied and said his leg might be chopped off. When Dumbledore later hits Ron's leg, he is saying that a child's voice no matter how honest and true. He is giving Ron a little payback for exaggerating.
Highly unlikely Dumbledore knew what Ron told Hermione at the Whomping Willow. Ron's leg was seriously hurt, so he wasn't "bragging" about it, nor did he lie. Ron, who is a bit of a hypochondriac, was simply embellishing to be more dramatic and to gain Hermione's sympathy. Hardly anything Dumbledore would consider worth giving him "payback" by inflicting pain.
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Answer: This didn't happen in the book. It appears to be done purely for comic effect in the movie, showing Dumbledore's eccentric and quirky nature. He's seemingly oblivious to what he's doing and how it affects Ron.
raywest ★