Plot hole: Harry never notices that the name "Peter Pettigrew" appears on the Marauder's Map, right next to "Ronald Weasley." Way beyond a character mistake, as there's no way that wouldn't be cause for interest. If nothing else, Ron's brothers who had the map for years before giving it to Harry, would most certainly have wondered why their brother was sleeping with a person named Peter Pettigrew.
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Harry Potter and the Prisoner of Azkaban (2004)
1 plot hole - 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
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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)
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.
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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Suggested correction: JK Rowling explained why Ron's brothers didn't wonder why Ron was sleeping with a man named Peter Pettigrew. Here is the link: https://scifi.stackexchange.com/questions/11447/why-couldnt-harry-or-anybody-else-see-peter-pettigrew-aka-scabbers-on-the-marau.
jon snow