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.
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
Other mistake: When Arthur takes Harry aside at the Leaky Cauldron, the moment before Arthur says, "There are some within the Ministry who would strongly discourage me from divulging what I'm about to reveal..." we can see the digital number "300" flash on the stone pillar to the right of the wanted poster. (This occurs only in the fullscreen version, as opposed to a widescreen version where the number "301" flashes underneath the poster, which is noted in another mistake). (00:17:30)
Sirius Black: Sorry about the bite. I reckon that twinges a bit.
Ron: A bit? A bit? You almost tore my leg off!
Trivia: Actor Tom Felton's Hogwarts' robes' pockets had to be sewn shut to prevent him from taking food on set.
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.
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