Continuity: In the opening aerial shot of the playground, the landscape surrounding it is flat, devoid of any shrubbery, and there are no buildings or streets nearby. In the close-up shots with Harry and Dudley that are shown from various angles, there are now houses, small hilly mounds, bushes, and a road in the background.

Continuity: At the playground, when Dudley and Harry have a confrontation, Dudley wears black shorts with large white designs of words and numbers. When Dudley and Harry enter the tunnel and then later, when yumpy Dudley is in his house, Dudley's shorts have completely different designs (though it is the same type of shorts).

Continuity: When the Dementors attack, Harry's wand falls. It changes position from the first shot; just note the cracks on the ground.

Continuity: When Harry shouts, "Expecto Patronum," he points his wand at 'his' Dementor as the Patronus repels it and it flees. Harry then stands and puts his wand arm down, but in the next shot his wand is still up, pointing to his right with the Patronus in mid-air.

Continuity: When Harry has brought Dudley home, as Uncle Vernon is telling Harry that he's finally driven Dudley insane, Dudley's expression changes between shots from crazy to normal. Aunt Petunia's arm also changes position around Dudley.

Continuity: At the Dursleys, when the owl delivers Mafalda Hopkirk's letter and it announces Harry's expulsion from Hogwarts, the fan on the counter noticeably changes its position.

Continuity: When the Dursleys leave in their car, there is a large hanging plant to the right of the front door with mostly large white flowers and some red. When Harry, Moody, Tonks and the rest leave the house, the flowers are now small and red.

Continuity: While still at the Dursley's, Harry has a dream and wakes up. When he wakes up there is moonlight shining on his pillow, right near his face. When the camera angle changes, the moonlight on the bed where his face is is gone.

Continuity: When Harry is talking with Hermione and Ron inside the room at the Black's house, in one shot Hermione's hair is covering the left side of her polo shirt, next shot you can see the logo because her hair is on her back. Seconds later, her hair is again covering her logo shirt.

Continuity: After riding down the escalator on their way to Harry's hearing, when Arthur Weasley tries to pass the turnstile, Harry's right hand reaches for the transit pass in his left jacket pocket in the side shot. Then he reaches once again in the front shot, before it cuts back to the side shot as he's still reaching for it. Also, note the man with the newspaper under his arm that passes the turnstile only to be back in line, between these shots.

Continuity: When Harry and Arthur Weasley head toward the sidewalk with the Ministry's phone booth, we see the asphalt they walk on. In the next shot of that street, there is a puddle of water precisely where they both walked puddle-free. [A common filmmaking technique. When shooting outdoor scenes in low light (like the overcast scene here) or at night, bare asphalt and concrete are frequently doused with water to give the surface a "softer" reflection of light. In this scene you can see some water on the ground in the first shot and wet concrete on the sides of the building. Apparently between shots the director called for more water (or it may have rained, but they probably got this shot with just a few short takes). Still a mistake, but there's the explanation.]

Continuity: Right before Harry enters the courtroom for his hearing, we see a close-up of his face and the ends of his eyebrows (closest to the nose) stick out. In the next scene, when he sits in the chair, they have been cut back slightly.

Continuity: Dumbledore wears a thin silver strand, with dangling silver balls, tied round his beard, and the position of this strand and height of the silver balls differ in consecutive shots, depending on the camera angle, throughout the film. For example, when Dumbledore stands before the Wizengamut during Harry's hearing.

Continuity: In scenes, but most noticeably in the court room scene, the tassle which hangs on Professor Dumbledore's hat keeps on changing position from whereabouts, and how it is hanging down.

Continuity: At the train station, when Moody sees Padfoot, Molly Weasley walks a certain distance behind Harry and the dog. Next close-up she is directly behind Harry, but when it cuts to the wide shot, she's much farther back again.

Continuity: At the Welcoming Feast, in the close-ups of Seamus and Harry sitting at the table, there is a substantial space between them. When Dumbledore says, "Good evening, children," and later, when he says thank you to Umbridge, the boys are sitting right next each other.

Continuity: In the Great Hall, when Dumbledore says, "Good evening children, I have two changes in staffing this year," we see Fred and George Weasley sitting in the fifth and sixth seats, and the other students near the end of the Gryffindor table. Next shot facing Dumbledore, we see the last seven students at that side of the table and not only are the Weasleys gone, but other students differ as well. This is also seen in additional shots.

Continuity: After Harry enters the Gryffindor Common Room, when Seamus stands up his white shirt is untucked just a bit at his back. As he stands with his hands at his sides, in the next shot from behind Seamus, now the entire shirttail is untucked.

Continuity: There are two scenes during which Harry is shown having visions of the Dept of Mysteries while he is asleep. The first scene occurs after Harry's confrontation with Seamus in the Gryffindor common room. There are shots of Harry lying in bed wearing a short sleeve, crew neck tee shirt, but when he is startled awake by the vision of Voldemort, he sits up wearing a buttoned henley tee. The next day is the first day of DADA class with Umbridge. That last shot of Harry in the henley tee shirt was cut from a later scene. Later in the film, when Harry has the vision of Arthur Weasley's attack, he is wearing the henley tee shirt.

Continuity: When Harry is in Umbridge's office to do lines, there is a framed photo of her beloved Cornelius and a bowl of potpourri at the corner of her desk. In the overhead shot of Harry, as he begins to write, the frame has moved towards the center of the desk.