Corrected entry: In the Ministry of Magic near the end, Neville tells Harry that he couldn't pick up the prophecy ball because it had Harry's name on it and only the person whose name is on a prophecy may remove it. But a few moments later Hermione is able to use her wand to make numerous prophecy balls fly off the shelves in order to escape the Death Eaters.
Corrected entry: When Luna just entered the Room of Requirement, and Filch, Malfoy, Crabbe, and Goyle are running after her. The members of the Dumbledore's Army are standing around the dummy practicing on it. It is extremely clear that Neville says expelliarmus, and succeeds, but no one applauds him (this is before he disarms Parvati.).
Corrected entry: During the scenes where "Dumbledore's Army" are practicing their spells, at one point they are using the spell 'Levi Corpus'. It is not until the next book (The Half Blood Prince) that this spell is actually discovered and used.
Corrected entry: While Harry is fighting with Sirius against the two Death Eaters, he just all of a sudden knows how to use non-verbal spells.
Corrected entry: The playground where Harry is during the first few scenes is located in a rural setting, separated from the nearby subdivision by a highway and an underground pedestrian walkway. However, when Harry first sees Sirius (in grim form) and the Knight Bus an the beginning of "Prisoner of Askaban," the exact same park is surrounded on three sides by houses. Though it is possible that contractors built the two identical playgrounds, it does not make sense why Harry and Dudley & co. would go all the way there when the other one is closer and doesn't involve leaving the neighbourhood.
Corrected entry: When Harry enters his room at the Dursley's after being expelled, this is the first time he's been in there since before the dementor attack, during which he used his wand. However, his wand is already lying on his bedside table when he enters the room although he should be carrying it on him.
Corrected entry: During the first DADA lesson Padma and Parvati Patil make a flying piece of paper, and it is clear that they are in the second row sitting behind two other people. Near the end of the scene it shows the two of them in the front row.
Corrected entry: In the Department of Mysteries, when each Death Eater has their wand aimed at a member of Dumbledore's Army, Lucius Malfoy walks towards Harry. Jason Issacs, who plays Malfoy, has brown hair, and in one shot you can see his real hair under the blonde wig.
Corrected entry: At the Hogshead's Inn, when the students are meeting with Harry to determine if they want him to train them, they begin naming some of his accomplishments. Nevill makes mention that Harry killed a basilisk in Dumbledores office, when, in fact, Harry killed the basilisk in the Chamber of Secrets, not Dumbledores office.
Corrected entry: When Lord Voldemort holds out his hand to receive the "prophecy-bubble" he is forcing Harry to give to him, we see a shot of Neville shouting "Don't give it to her!" Her? You-Know-Who isn't exactly a very masculine type, but... (There was probably a scene with Bellatrix there which was cut out.)
Corrected entry: When Harry is having a dinner with the Order of Phoenix group, look at the glasses - the liquid inside differs from empty to full from shot-to-shot.
Corrected entry: When Umbridge gets caught by the fireworks-dragon, the doorway fills with smoke. Umbridge vanishes from that shot; the smoke clears enough to see that she isn't there anymore. She reappears in one of the next shots, after the ministry decrees have fallen down and the smoke has cleared.
Corrected entry: In the scene where Harry first arrives at Sirius's house, Ginny is seen laughing at Tonks's nose. In one shot, she has her hand over her mouth, laughing. In the next shot, a wideshot of the whole table, her hand is no longer over her mouth and she has a straight face.
Corrected entry: In the movie, the spell Stupefy is used in the Room of Requirement. The spell should make Harry become knocked out but he just flies backwards.
Corrected entry: The established continuity of traveling through fireplaces tells us that to do so, one must throw floo powder into the fireplace you are using, then state your destination. However, during the battle between Voldemort and Dumbledore, Bellatrix Lestrange simply crawls into a fireplace and leaves. Even if she didn't care about her destination, she still skipped the important first step- the floo powder was never thrown in.