Corrected entry: The Knight Bus comes to a halt just short of an elderly person who is crossing the street. Through the bus's window the crystal chandelier can be seen swinging, due to the sudden stop, from side to side. But it ought to swing front to back, owing to its previous motion.
Corrected entry: In the Hospital Wing scene near the end of the film (when Harry and Hermione go back in time after protesting Sirius' innocence) Dumbledore finally closes the doors after the Hogwarts clock chimes seven times. The clock then carries on to chime roughly the right number of times for being apparently 10:30pm (11 times before Harry and Hermione go back in time). In the later scene, when Harry and Hermione have just seen Sirius leave, they run up to the Hospital Wing, as Dumbledore closes the doors after the eighth chime, not the seventh as before. The clock then carries on chiming through the rest of the scene until it strikes 13. (02:05:30)
Correction: No, the clock chimes 7 times exactly as the first time it did it.
Corrected entry: The second time Harry uses the Patronus charm, Hermione is visible standing next to the tree behind Harry. The first time Harry uses the Patronus, his silhouette can be seen, but there's no sign of Hermione next to the same tree.
Correction: This is because of the view. it's a closer-up view of Harry, so that's why we can see her, but the other view is from the other side of the lake,which is Harry's.
Corrected entry: When Harry and Hermione have travelled back in time, she tells him that they mustn't intervene with anything as terrible things happen to witches and wizards who meddle with time (they think they've gone mad). During the whole experience, they are both very careful not to be seen. Yet as they are rescuing the hippograff, after going back in time, surely the past Harry, Ron, and Hermione would have seen the future Harry and Hermione rescuing the hippograff from the top of the hill they were standing on?.
Corrected entry: After the Dementor attack on the train, Professor Lupin offers Harry a piece of chocolate and then puts the chocolate bar down on the seat next to Harry. It cuts to Prof Lupin leaving the train, but when it cuts back, the bar of chocolate has mysteriously disappeared.
Corrected entry: When Peter Pettigrew transforms himself into a rat and escapes, he leaves behind his clothes. In all Harry Potter films, including Prisoner of Azkaban, an Animagus is able to transform back and forth fully clothed.
Correction: This is not entirely correct. In Philosopher's Stone, Professor Magonagall turns from an unclothed cat into a woman. Same with Sirius Black in POA. Peter Pettigrew would only obtain his clothing upon changing into a man, not vice versa. Leaving his clothes behind wouldn't necessarily matter, as new clothes would, of course, magically reappear when he transforms back into human form.
Corrected entry: Throughout the final night of Aunt Marge's stay, Aunt Marge (on her chair) keep switching positions.
Correction: I watched this scene a few times and Aunt Marge does not change positions.
Corrected entry: When the Whomping Willow tree branch comes down and Emma Watson jumps over it, you can see a wire attached to her hip.
Correction: I watched this clip a few times, there is no wire attached to her. There's a really dark space below her jacket which makes it look like she has a wire attached to her hip, but none is seen.
Corrected entry: While Aunt Marge is sitting at the table, Harry pours Marge a drink. Then Aunt Marge criticizes him again, and he turns around. When he does, the cup and drink switch positions.
Correction: Harry never pours Aunt Marge a drink.
Corrected entry: While Aunt Marge is at the table, the glass breaks in her hand and in the next few shots the pieces of the glass are gone.
Correction: Nope, I watched this scene a few times and the glass pieces are still there. They are just not really visible.
Corrected entry: At the end, when Harry tries out his new Firebolt broomstick, he flies up and to the right. The students behind him, including Malfoy, are looking in the opposite direction of where he flew.
Correction: No, I watched this scene a few times and their eyes did follow him as he flew.
Corrected entry: In the scene where we first see Ron and Hermione, we can see that Crookshanks' upper body is resting on her right arm. Instantly, in the next shot, Crookshanks is on her left arm.
Corrected entry: In the scene in Hagrid's hut when Harry, Ron and Hermione are leaving we can hear Cornelius Fudge say "the Hippogriff known as Buckbeak is to be executed at sundown." However they exit to execute him not even five minutes later, no where near sun down as the sun is visible in the sky.
Correction: The actual execution is to occur at sundown - therefore, all preparations for the event must occur prior to sundown. Buckbeak is merely tied up so that he can't wander off, he's not actually physically restrained in any significant way, and he's hardly likely to hold still while the executioner swings a large axe at his head. Hagrid is presumably required to tie Buckbeak more securely, so that Macnair can do his job - given that Buckbeak is hardly likely to be happy about this, this process may well take some time. Bear in mind the executioner's axe-swing was never aimed at Buckbeak - only the pumpkin due to being frustrated.
Corrected entry: In the scene where steam shoots from Harry's ears after eating the candy, you can see that the steam is coming from tubes behind his ears.
Correction: The smoke is computer generated, so it is not possible any tube or gadget could be seen in any way.
Corrected entry: In the scene where Harry and Prof. Lupin are on a bridge talking about Harry's parents, Harry's eyes keep changing colors. First they were both green, then one was brown and one was green.
Correction: Harry/Daniel's eyes are blue during the whole movie. The colour is not modified in any way.
Corrected entry: When Aunt Marge has been blown up and is floating out into the garden, Vernon grabs a hold of her hands. From the shot looking at Vernon, Marge's cuffs on her jacket are very wide and loose around her wrist - but in the next shot of Vernon looking at Marge the cuffs are tight around her wrist. (00:05:25)
Correction: Wouldn't this be because Aunt Marge keeps getting larger and larger as she goes up?
Corrected entry: In the scene where they (the Griffindors) go to the fat lady the first time she opens inward, then the shot changes to look like it was in the common room, and the fat lady's portrait is now open outward.
Correction: I've watched this scene a few times and its just not possible to tell from the angle the camera has. You can't even see the fat ladys portrait once Harry and Seamus have entered the common room.
Corrected entry: When Harry goes over to Buckbeak, he pulls the chain and it comes through the ring so easily, that it looks like it isn't connected. This is probably to make it easy for Harry to free Buckbeak, but it means that Buckbeak could have flown away on his own, when he was supposed to be secure.
Correction: Like training Elephants, from birth they are restrained tightly until they learn that when a chain is attached to them they can't flee. Eliminating the need later to have a secure anchor.
Corrected entry: When Harry takes the lollypop out of the candy shop in Hogsmeade, you can see a wire being used to make it fly.
Correction: I checked this mistake out, and the lollipop is CGI, no wires were used.
Corrected entry: When Lupin is talking to Harry on the bridge between the castle and the grounds, he bumps his head on the pillar.
Correction: I have watched for this and he does not bump his head.
Correction: I watched this scene a few times, and the chandelier does swing from front to back.