These are the mistakes that were spotted in the books. Thanks to all who submitted these. See an error we don't? Tell us!

The Sorcerer's/Philosophers Stone

Harry buys the book "One Thousand Magical Herbs and Fungi", but later in the book it says Harry looked up 'dittany' in "One Hundred Magical Herbs and Fungi."

Petunia Dursley says that Lily would "...come home every vacation with her pockets full of frog spawn, turning teacups into rats...," but according to ministry rules, this is illegal. If she did this in her Muggle home sh would most likely be expelled.

It says that Harry looked up at the Sorting Stool, there were only 3 people left to be sorted, Professor McGonagall calls the names of 4 more people instead.

In Book one, Prof. McGonagall brings out a 4 legged chair with the sorting hat (to the sorting ceremony). In book four, she brings out a 3 legged chair with the sorting hat.

In Harry's letter from Hogwarts it says he could bring a cat, an owl, or a toad, but Ron brings his rat, Scabbers.

During the chess match, it said that Ron was the knight in the giant chess set. However, it later said that he had to 'move ahead one' so the Queen could take him, opening the path for Harry to checkmate the king. If he was a knight, he could only move 1) ahead one, sideways two, or 2) ahead two, sideways one, like an "L".

Harry Potter and the Chamber of Secrets

At the end of the second book Dumbledore tells Harry that Lord Voldemort is the last remaining ancestor of Salazar Slytherin. But it should say that Lord Voldemort is the last remaining descendant of Salazar Slytherin.

In the first book, Nearly Headless Nick says that he hasn't eaten in "nearly four hundred years." But, in the second book, he's celebrating his "five-hundredth deathday.

Page 283 at the start of Chapter 16, very last word on the page is Professorr, it should be Professor, with only one R.

Dobby seems to be apparating and disapparating inside the grounds of Hogwarts. He also seemed to apparate and disapparate while Harry was in the hospital wing recovering from his arm accident. But in Harry Potter and the Prisoner of Azkaban, Hermione states numerous times that it is impossible to apparate and disapparate inside the grounds of Hogwarts. How can this be?

In their Hogwarts Equipment list, it says the Lockhart book "Wanderings with a Werewolf." However, later in the book, it mentions "Weekend with a Werewolf." 

On page 182 of Book 2, Harry is still in the hospital. But it says: "Harry woke up on Sunday morning to find the dormitory blazing with winter sunlight and his arm reboned but very stiff." He wasn't in the dormitory. He was in the hospital.

On page 95, it states that Nearly Headless Nick "took several deep breaths, and then said, in a far calmer tone, 'So what's bothering you?'" However, on page 506 of GoF, Myrtle says that ghosts do not breathe: "When I can't ...when I haven't...not for ages..."

Harry Potter and the Prisoner of Azkaban

In Chapter 19, The Servant of Lord Voldemort, page 370, it states that Voldemort had been hiding for 15 years. If his power was lost only twelve years ago, why was he hiding that extra three years?

In chapter 15, The Quidditch Final, it said Madam Hooch's whistle rang out as she soared over to Montague and began shouting at him. A minute later, Katie had put another penalty past the Slytherin Seeker. It should say the Slytherin Keeper.

In chapter 3, The Knight Bus, the driver Stan told Harry that the price to get to London was 11 sickles. But in the book it said Harry shoved some gold into Stan's hands. Sickles are silver, not gold.

After Harry and Hermione get back from saving Sirius and Buckbeak, Dumbledore locks them inside the hospital wing. However, it says "Harry and Hermione slipped back inside the dormitory." It should say hospital wing.

On page 285 (US Edition) it says "Snap" picked up Harry's Zonko's bag. It should say Snape.

Harry Potter and the Goblet of Fire

In book four, during Priori Incantatem, Voldemort's victims came out in reverse order. but, James came out before Lily. That would mean that James died after he killed Lily and it said all over in the books that he killed James first. - This was an error fixed in later versions of the book, so need to invent crazy theories

In the second book it says that Moaning Myrtle haunts the U-bend of the toilet. But in book four, it says that she haunts the S-bend of the toilet.

When Fudge, Dumbledore, and Moody are talking about Crouch, instead of Fudge yelling to Dumbledore, it says: "said Crouch angrily". He wasn't in the room...they were talking about him, not with him.

Sirius says, "You three and Dumbledore are the only people who know I'm an Animagi." But Snape and Lupin know too. - It's possible that he forgot in the heat of the moment.

In one of Harry's letters to Sirius he mentions that Dudley got angry and chucked his Playstation out of the window. However, the playstation was not out at this time. GoF is set in 1994, and the Playstation was only available as an import to the UK in the fall of 1994 when Harry was at Hogwarts for his fourth year.

On page 152 in Harry Potter and the Goblet of Fire it says, "'Well, Father feels he's got to make up for his mistake at the match, doesn't he?' said Percy. 'If truth be told, he was a tad unwise to make a public statement without clearing it with his Head of Department first--'" The thing is, is that Arthur Weasley is the head of his Department so who was he supposed to clear it with? Arthur Weasley was established as Head of Department in the Daily Prophet article in Prisoner of Azkaban about the family's trip to Egypt.

Harry Potter and the Order of the Phoenix

Harry uses the Marauder's Map several times in this book, but it was confiscated in his fourth year. How did he get it back?

Second-year student Dennis Creevey goes to the Hog's Head for the first DA "meeting", but only third-years and older are allowed to go to Hogsmeade during term time. 

Chapter 28, pages 625-626, Malfoy starts docking points from both Gryffindor and Hufflepuff after becoming part of the Inquisitorial Squad and Ernie Macmillan says, "He can't be allowed to dock points...that would be ridiculous...It would completely undermine the prefect system..." But in the second book, chapter 9, page 158, Percy, a prefect at the time, takes 5 points from Gryffindor after finding Ron, Hermione, and Harry looking around Moaning Myrtle's bathroom. So how was Percy able to take points from Gryffindor if prefects aren't even able to?

>Before Harry's first Quidditch match, Harry is glad that it is cloudy, but than later JKR explains that the stadium is in dazzling sunlight. How do you have dazzling sunlight in a cloudy day?

On page 710 it says that Parvati and Lavender were practicing basic locomotion charms making their pencil cases race each other. They use scrolls and quils, what would they be doing with pencil cases?

On page 715 (US Edition) When Harry was taking his Transfiguration practical owl he sees Hannah Abbot trying to vanish an iguana. However they were being tested in alphabetical order. Potter comes after Abbot. It is possible that they were being taken in according to their first names.

In chapter 28, page 626, Malfoy docks Ron five points because his shirt's untucked, but since they were in between classes, Ron would being wearing his robes, not a shirt.

Harry Potter and the Half-Blood Prince

"The site, therefore, of Fudge stepping out of the fire once more" pg 10 (US) - should say sight.

"If Malfoy wants something fixing . . . it's probably something Dark or dangerous, isn't it?" pg 135 (US) - In British English one does say fixing, but in American English it's "fixed".

"The misty fug his breath had left on the window" pg 38 (US) - Not an error. Fug is a British word for “a stuffy or malodorous emanation”.

“Had a house-elf taste every bottle after what happened to your poor friend Rupert.” pg 485 (US) - JKR did not forget Ron's name. According to her publisher: "We’ve received a number of e-mails suggesting that Ms. Rowling must have been thinking of Rupert Grint (who plays Ron in the films) here and thus accidentally substituted his name for Ron’s. But truly this substitution is a deliberate choice on Ms. Rowling’s part: She is underlining the fact that Professor Slughorn has never paid very much attention to Ron, to the point that he still gets Ron’s name wrong even after Ron almost died in his rooms, and thus pointing up again Slughorn’s particular taste for “the company of the famous, the successful, and the powerful,” as Dumbledore says, over those who may be less flashy but are just as worthy, like Ron.".

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