Corrected entry: As part of the preparations for Bill and Fleur's wedding, Mrs. Weasley confronts Charlie about his hair, and he is later observed to be running his hand over his "brutally short haircut." However, when Bill and Charlie first appear in Goblet of Fire, it was Bill that who was scolded by Molly for having long hair. The first description of his appearance (when it is observed that he looks "cool"), specifically mentions his long hair. Charlie's hair isn't mentioned at all.
Corrected entry: The Taboo on Voldemort's name is how Harry, Ron, and Hermione are found in Tottenham Court Road. How is it they are not found later in Grimmauld Place? Doesn't the taboo disrupt any and or all forms of magical protection, such as before they are taken to Malfoy Manor from the woods?
Corrected entry: After Ron and Hermione meet Harry after going to the Chamber of Secrets to get a basilisk fang, Ron demonstrates how he opened the entrance to the Chamber of Secrets. He made a 'strangled, hissing noise'. Harry was still a Parseltongue, right? Harry should have heard 'open'. Of course, he did copy Harry, but you can still understand when someone imitates another language, right?
Corrected entry: In chapter nine, after confronting the death eaters in the cafe, Hermione tells Ron and Harry that she has never performed a memory charm before. Yet in chapter six she explained to them that she had used a memory charm on her parents to make them forget all about her and move to Australia where they would be safe.
Corrected entry: Dumbledore is tormented by the thought that he may have been the one to accidentally kill his sister as she got caught in the midst of the duel between Grindenwald, his brother and himself. However there is a spell referenced and used in this book and priors that can be cast to reveal a wand's prior actions.
Corrected entry: At least twice in the book, it states that Dumbledore had defeated Grindelwald in their historic duel. How did this happen if Grindelwald possessed (and was master of) the Elder Wand at that time?
Corrected entry: In the chapter, "Prince's tale", there's a memory in which Snape and Lily are talking about the friends of each other (the memory begins with Snape saying "I thought we were friends"). In this memory, Lily says that James has saved Snape's life, but Snape says that he was only saving himself. Some lines before, Snape makes it clear that he doesn't know that Lupin is a werewolf. However, in "Prisoner of Azkaban", Lupin said (and Snape himself) that after James saved Snape's life, he knew that Lupin was a werewolf. So this memory doesn't match - if James already saved Snape's life, he should've known that Lupin was a werewolf. (And that's why he would say that James was only saving himself).
Corrected entry: Near the end of chapter thirty, it says that the only people left in the room of requirement are Harry, Ginny, Mrs Weasley, Lupin, Fred, George, Bill and Fleur. But on the next page Percy (who had recently entered the room) says sorry to Mr Weasley, but Mr Weasley had left the room along with all the other people.
Corrected entry: Harry tells Hermione that he has barely opened "A History of Magic" since the time that he bought it, but in the opening scene of "Prisoner of Azkaban," he is doing his homework out of it (and seems reasonably familiar with the text).
Corrected entry: In Chapter 36 named "The Flaw in the Plan", Harry sees Charlie Weasley (from the Order) overtaking Horace Slughorn. However, on the opposite page, Voldemort is dueling other Order members (McGonnagall and Shacklebolt), and Slughorn is seen fighting Voldemort alongside them. Who is Slughorn fighting for?