Corrected entry: When the Dementors are entering the Hogwart Express, the lights in the compartment where Harry and his friends are, are turned off but when there's a view from outside, the lights are suddenly on.
Corrected entry: In the scene when Hermione removes the invisibility cloak from Harry who is sitting on the rock crying, a few flakes of snow fall on his shoulder. The next shot of Harry immediately after shows no snow on his shoulder.
Correction: It melted. You see it soak into his top.
Corrected entry: In the defense against the dark arts class in which Snape is the substitute. Hermione's time turner is initially unseen, then in the next shot visible, and then unseen again.
Correction: No, the time turner is seen first, as she just got there. Then there is enough time between shots for her to have put it away.
Corrected entry: The seeker for the other team during the Quidditch match is struck by lightning early on. The Hogwarts teams don't have second string team members, but somehow they still manage to win, after Harry's been assaulted by the dementors. Who caught the snitch to end the game?
Correction: We don't see Cedric Diggory (the other seeker) leave the game, he could just have fallen for a while then caught the snitch on his way back up, before he realised Harry had fallen, as it is in the book.
Corrected entry: In the scene at the Shrieking Shack where Malfoy is being dragged by the foot by Harry who is under the cloak, the dragging marks can be seen while Harry's footprints aren't visible, yet they can be seen in later scenes, ie. when he runs from the bar.
Correction: If Malfoy is being pulled that means Harry is in front of him pulling him behind his back, in which case Malfoy's dragging marks would cover up Harry's footprints.
Corrected entry: In the scene when all the kids are leaving for Hogsmeade, you can see that Harry's face is pressed against the inside of the big clock tower overlooking the entrance to Hogwarts. Later on in the movie, when Harry and Hermione are back in time, the camera zooms through the same clock and you can see that the back is covered by lots of equipment. How did Harry have his face pressed against the glass?
Correction: When you see the scene later in the movie you can see a ledge that is right next to the face of the clock with the gears behind the ledge. Since in the earlier scene you can see the gears working behind him one can presume that he is standing on the aforementioned ledge.
Corrected entry: When Harry and Lupin are practising the Patronus charm alone, the second time Lupin closes the boggart back into the chest he neglects to lock it in.
Correction: It is opened and locked by magic, as is shown in the close-ups of it opening. After Lupin closes the trunk the second time he leans on it, hits the top of it with his hand, and has a few more moments on and near the trunk while the camera is focused on Harry sitting on the steps. It would have been very easy, during this time, for Lupin to have magically locked the trunk.
Corrected entry: When Harry is trying to "tame" his monster book, he takes off his left shoe to taunt it. When he jumps on the book at the end of the scene, his left shoe is on and his right shoe is removed.
Correction: No, he takes his right shoe off. The shoe twists around a bit as he is holding it in the air, but it was definitely his right shoe.
Corrected entry: It is awfully light in the hospital wing when Dumbledore tells Hermione to use the Time Turner, considering that the action just beforehand took place in definite darkness.
Corrected entry: The end of the movie takes place during the spring semester, yet at Buckbeak's execution we see piles of pumpkins. Where did they get pumpkins during the spring?
Correction: Since pumpkin juice is the drink of choice at Hogwarts, they'd have to have some magical way to grow them year-round.
Corrected entry: When Buckbeak "attacks" Draco, he scratches him on the left arm, but in the next scene in the Great Hall, it is Draco's right arm that is bandaged.
Correction: Draco clearly lifts his right arm for protection when Buckbeak rears up, and falls to the ground with a tear in the right sleeve of his cloak.
Corrected entry: When Peter has been changed back into a human he holds up his hands and there are definitely ten fingers. In the next shot there is a finger missing on his left hand but during the rest of the scene it alters all the time.
Correction: No, he is always missing part of a finger on his left hand. Because of some of the angles it can look deceptive, indeed I had to look closely at it, but the finger in question always has a part missing.
Corrected entry: As Black is leaving on Buckbeak, Buckbeak only takes a few steps and climbs rapidly in to the air. But when Harry is riding him it takes quite a distance to get enough speed.
Correction: It's never stated that Buckbeak has to get up any speed to take off. It may just be easier with a running start, which he has room to do in the forest but not on the rooftop.
Corrected entry: In the Shrieking Shack confrontation, the Disarming Charm is used several times. Isn't it odd how the effect of 'Expeliarmus' has lessened from the explosive body-throwing of the second movie to barely plunking wands to the ground in the third?
Corrected entry: After the trio leaves Hagrid's Hut before Buckbeak's execution and hide behind the pumpkins, Hermione crouches and turns to the left thinking that she saw herself. Later on when Hermione and Harry go back in time, she turns to the right and simply bends over without crouching.
Correction: She turns towards her right both times.
Corrected entry: After Harry faces the boggart which changed into a dementor during the Defense Against the Dark Arts class, Lupin tells the class to go. Harry still stares at the spot where the boggart was. If you look closely you can tell the shot was reversed for Harry's scar is on the wrong side of his forehead.
Correction: This is simply because this is clearly shot as the reflection in the mirror set into the cabinet, which you can see as the camera moves into the mirror (the wooden edges can be seen).
Corrected entry: At the end of the film when Harry is in Lupin's office, just after Lupin has said Harry can have his map back, he folds it up on the table. Then Lupin leaves the office, as Harry turns to watch him walk down the stairs, you can see the table over Harry's shoulder, but the map has disappeared and Harry did not pick it up.
Correction: It did not disappear. Harry's body is simply blocking part of the desk.
Corrected entry: When we catch glimpses of Hermione's time turner throughout the film, it appears to be on a small chain around her neck. However, when she wraps it around herself and Harry in the hospital wing, it is much longer to wrap around the both of them.
Correction: If you look closely enough at the chain you can see that she has wrapped it around her neck multiple times so it is not as long. The chain doesn't rapidly change length, she just wraps around her neck more then once and unwraps it to place around both Harry and herself.
Corrected entry: After Sirius has flown away on Buckbeak, the clock bell begins to toll, altogether there are 14 tolls. Even in the magic world there isn't a 14 o'clock. And since the time turner goes back in hours (stated in the book) it should be three hours on from 7.30pm, making it 10.30, and don't most clocks strike on the hour?
Correction: It chimes twelve times.
Corrected entry: When Harry is attacking Malfoy, Crabbe and Goyle near the Shrieking Shack while under the invisibility cloak, Harry moves very rapidly, as he attacks two people at the same time. They couldn't possibly have been hit by Harry as he was swinging one of them around by the scarf. Also he is far away from this action and no contact is seen to have happened.
Correction: Harry was only attacking one person. He was swinging one of them round by the scarf while the other one tripped over the boy lying on the floor. Harry never touched him, let alone push him over.
Correction: Different compartment. There are several compartments with light in them when we see the train from outside, and one by one they go out.