Continuity: During the class with Hagrid, sometimes Ron has his Monster Book of Monsters under his arm and sometimes he doesn't have it.

Revealing: In the Shrieking Shack, just after Scabbers becomes Pettigrew, when Sirius and Lupin pull him out of the hole, as the camera faces Pettigrew's back while they hold him, the blue tape on his 'missing' finger is visible for 2 frames. (It is necessary to go frame-by-frame.)

Continuity: In the first Divination scene, Prof. Trewlaney reads Neville's cup then puts it down onto a saucer. However, in the next shot, Neville picks it up from the tabletop.

Continuity: In the corridor when Harry shows the blank map to Snapes he is holding it only in his left hand. When the view switches he has both hands on it, and in the next shot is again holding it in one hand.

Continuity: When one of the Weasley twins says, "Not flashing that clipping again." to Ron, we see Ron holding Scabbers. The way he holds Scabbers changes in the next shot.

Continuity: In the Boggart scene, Lupin jumps in front of Harry to stop him from facing the Boggart. Between the shot directly before he jumps and the shot where he jumps, there is a dramatic change in his hairstyle.

Continuity: The second time Harry conjures the patronus charm to save Sirius and the other Harry from the dementers, Hermione is standing next to the tree behind him. The first time he uses it, his silhouette can clearly be seen from the other Harry's point-of-view from across the lake, but Hermione isn't next to the same tree, even though the spot she was standing is clearly visible.

Continuity: In the shots facing Harry, when he unbuckles the belt around the Monster Book of Monsters and when he lifts the book to look at it, the wood box on the dresser near the the water pitcher faces the fireplace. In the rest of the shots it faces the bed.

Continuity: When Harry, Ron and Hermione first exit Hagrid's cabin to get away from the ministry, they wait a lot longer at the door before running away, than when Harry and Hermione go back in time.

Continuity: The chain on the Time-Turner changes length from when they go back in time, and to when Hermione explains the Time-Turner to Harry, one minute later.

Continuity: During the scene in which Uncle Vernon's sister Marge is turned into a balloon we see her floating out of the conservatory. A second before she is blown out the door we see from the shot looking into the conservatory that Aunt Petunia is to the right of the conservatory doors inside the dining room. When the shot changes, she is now standing in the doorway to the conservatory.

Continuity: When Uncle Vernon is pouring brandy to Aunt Marge we see Harry picking up a plate from the floor while holding two other plates in his left hand. When it cuts Harry is still holding the two plates, but something which appears as a napkin or something has appeared in his hand as well. You can see it sticking out between the plates. Whatever it is it wasn't there in the previous shot.

Revealing: Watch as Hedwig lands on Harry's arm. It's quite obvious he has some protection under the shirt sleeve as his arm and wrist is unnaturally thick.

Continuity: When the Dursleys are in the dining room, the chair located near the telephone, on the kitchen counter, changes position throughout the scene. In some shots its back is right beside the phone, in others not, and then in other shots its back leans right up against the wall and in others it is positioned well away from the wall.

Continuity: At the Shrieking Shack, when Scabbers tries to run away, as he runs towards the small hole in the wall, the shape of the hole differs in the shot facing the rat's hind and the next shot facing Scabbers, just as he enters the hole. (Obviously before the hole enlarges to accommodate Peter.)

Continuity: During Hagrid's lesson, when Harry walks towards Buckbeak as Hagrid explains to Harry that he needs to wait for Buckbeak to bow back, etc., in the next shot a boy on the left of the screen drops his cloak to the ground. In the next shot of the students, the boy has it on his arm again, but in the next shot as Harry bows, it's on the ground once again.

Continuity: In the DADA class, when Lupin puts the needle on the horn gramophone disc to start the music, the position of his hand and the needle in the close-up differs greatly than in previous and following shots. Throughout the scene the gramophone and its horn's position differ in consecutive shots as well.

Revealing: After Ron has been dragged down the hole by the Grim, you see both Harry and Hermione get hit by The Whomping Willow and they fly backwards and land on the ground. Notice when Harry places his left arm in the ground, the ground is unnaturally soft.

Revealing: After receiving the new Firebolt Harry runs outside to use it. In the close-up as he takes off and in the next wide shot many of the students' eyes are not in sync with Harry's flight.

Continuity: When Hermione removes the blanket that makes Potter invisible you can see some snowflakes on his shoulder. It cuts and she says "Harry, what happened?", then it cut again and the snowflakes are gone. They could not have melted that fast.