Corrected entry: At the end of Chapter Twelve, when Harry is in Professor McGonagall's office, he repeats what Hermione said about the Ministry interfering at Hogwarts. McGonagall responds with "I'm glad you listen to Hermione Granger." However, Hermione made the statement when she, Harry, and Ron were sitting in the Great Hall during the Welcoming Feast. McGonagall was at the staff table and should not know what Hermione said.
Corrected entry: In chapter twenty-five, when Harry and Cho are walking to Hogsmeade together, Harry says that he saw Oliver Wood at the Quidditch World Cup "last year." This scene is taking place in February of 1996 and the World Cup was in August of 1994. Harry actually saw Oliver the year before last year.
Corrected entry: In chapter 9, when Harry lets Hermione borrow Hedwig, Harry remains bent double until he hears Hermione close the door. However, when he hears Hermione and Hedwig had gone, he hurries across the room and closes the door, but the door had already been closed.
Corrected entry: Harry says that Dobby had left the Malfoys to give him warnings two years ago, but that happened in book two, which was three years ago. Dobby was still employed by the Malfoys when he arrived to warn Harry.
Corrected entry: When Tonks is in Harry's room and Tonks talks about her being an auror she says that she became an auror only one year ago. But later in the book, at careers advice, Professor McGonagall says that no one has been taken on as an auror in three years.
Corrected entry: In the scene where Malfoy is taking points off Harry, Ron, Hermione and Ernie Macmillan at the start of chapter 28, Ernie states that Prefects can't take away house points, but in "The Chamber of Secrets" Percy Weasley takes ten points from Griffindor because Harry & Ron are in Moaning Myrtle's.
Corrected entry: Harry and Hermione get their wands taken from them when they are caught using Umbridge's fire. After the centaur attack the others break free and come to meet Harry and Hermione. After this point they have their wands, even though nothing was mentioned to say how they got them back.
Corrected entry: In the practical exams for their OWL's, the students are called in alphabetical order by last name. Yet Harry is in at the same time as Hannah Abbot for one of their exams. Abbot and Potter should not be together.
Corrected entry: In the British version of book 5, it talks about Algernon Rookwood, but in book 4, it talks about Agustus Rookwood.
Corrected entry: In the chapter where Harry and company are having their Care of Magical Creatures with Prof Grubly-Plank, she says to turn in their drawings of bowtruckles at the end of class. In a later chapter, Harry says he has to finish the bowtruckle drawing.
Corrected entry: In Chapter 17 Harry hands an injured Hedwig to Professor Grubbly-Plank who says "Thestrals will sometimes go for birds, of course." The next paragraph states that "Harry neither knew nor cared what Thestrals were". However, in Chapter Ten there is a discussion about them between Luna Lovegood and Harry who can both see them pulling the carriages, as well as a paragraph where Harry is pointing them out to Ron.
Corrected entry: In book 1, it says that James and Lily Potter were Head Boy and Girl. You have to be prefect to become head boy or girl. In this book, Sirius tells Harry that his father (James) was not a prefect.
Corrected entry: At the beginning of the book, Harry is given a gift by Sirius. This is a gift that he does not open until after Sirius is dead, and he finds it to be a communication mirror. Not once in the rest of the entire book is this present mentioned. Even when Harry uses the fireplace and risks everything to talk to Sirius, Sirius does not mention opening his present, and during the weeks of Christmas break, when they are actually face to face, no one mentions it either. This is a valid plot hole because it is highly unbelievable that such a valuable gift would have ended up in Harry's hands and not used. With that mirror in use, most of the miscommunication in the book would have been avoided, making the plot seem suspiciously forced.
Corrected entry: Hermione is knitting hats to free the house elves of Hogwarts. but the elves don't belong to her, they belong to Dumbledore. So technically they can't be freed by students, only Dumbledore.
Corrected entry: In chapter 28, it says that every person in the school seemed to know how Dumbledore had overcome two Aurors, the high inquisitor, the minister for magic, and his junior assistant. Percy is the minister junior assistant, and Percy wasn't in the office with him, as he left moments after Dumbledore's "confession" to send his notes to the Ministry.
Corrected entry: In preparation for their exams, Parvati and Lavender were making their pencil cases race around. However, they use quills, so why would they have a pencil case?
Corrected entry: In the chapter Luna Lovegood, Harry sees the thestrals for the first time, because he saw Cedric die at the end of last term. But he didn't see the thestrals when he left Hogwarts before the summer.
Corrected entry: In chapter 27, Fudge says, "Or is there the usual simple explanation involving the reversal of time, a dead man coming back to life, and a couple of invisible dementors?" Fudge never knew about Hermione and Harry using the Time-Turner to rescue Sirius in book three.
Corrected entry: When discussing former Defense Against the Dark Arts teachers, it's brought up that "one sacked, one dead, one's memory removed and one locked in a trunk for nine months." Lupin is the sacked one that's referred to, but he didn't get sacked, he resigned.