Continuity mistake: When the jar is smashed in Hagrid's hut, the lid stays on the smashed jar, yet when Hermione picks up the stone which smashed the jar, there is a closeup of her hand holding the stone and you can see the lid of the jar on the table. (01:21:30)
Continuity mistake: In the first exterior shot looking through the Dursley's patio doors, as they have dinner, and later when Vernon runs after Marge, the threshold is wide, flat and all white. Below the glass on the doors the trim is narrow and at the very bottom it is wide. There is a keyhole opening (on the left door) under a particular style door handle and there is a wide double lip going round the entire edge of the left door. When Petunia runs out, the threshold is higher up and mostly brick, with a thin strip of white in the middle. The style of the patio doors under the glass is completely different, there is no keyhole, the handle style differs and there is no double lip on the door. Additionally, the large clay pots with plants, beside the doors, change from being glazed and shiney to being unglazed, its plants differ and things change position. (00:02:00 - 00:05:00)
Continuity mistake: As Harry approaches Lupin's desk, the open trunk is visible to his left, near the window. When Lupin tucks his belongings away in his trunk, items such as the books are positioned differently. (02:06:30)
Continuity mistake: As Harry reaches Lupin's office, Lupin stands by the bookcase and the front end of the valise under the desk points towards the right. However, when Lupin says, "No, no, I resigned," the front end points the opposite way. Then when Harry walks to the doorway, it's the same way as the first shot. (02:06:10)
Continuity mistake: After Ron, Hermione and Harry run out of Hagrid's they hide behind the pumpkins, while the other Hermione and Harry look on as they hide behind trees. When Hermione comments about her hair, the tree branch she moves away is completely different between the shots facing her and the shots facing Hagrid's. (01:52:10)
Continuity mistake: When Harry gets on the Knight Bus, as he's stepping on, half of his jacket is wet (on the bottom) from falling on the wet pavement. Once he's on the bus, there's a quick shot of him from the back, and it is all dry. (00:08:40)
Revealing mistake: When Ron and Hermione are arguing with Malfoy near the Shrieking Shack, Malfoy visibly flinches before he is hit by the first snowball. He's not looking in the right direction to see it coming. (01:02:15)
Continuity mistake: In the first shot at dinner, when Marge says, "Finish that off for Mommy...Rippy-pooh," she places her plate down on the carpet for Ripper. In the view under the table, Harry's and Vernon's legs are visible and Vernon walks past Dudley. In the next shot, Vernon comes from the side and walks past again. (00:02:25)
Continuity mistake: The cuts including the one with butterfly closures on Hermione's cheek and the scratches on Harry's cheek change position/characteristics in many shots throughout, even in consecutive shots.
Continuity mistake: After leaving the Dursleys, Harry sits down on the pavement beside his trunk, with no room between the two. When he turns to look at the squeaking swings, in the shot from behind him, there is at least a foot of space between Harry and the trunk. Yet in the next shot that faces him, the trunk is beside him once again. (00:07:20)
Continuity mistake: When Vernon holds Marge's hands as she floats up, in the shot just before she yells, "Don't you dare!" Dudley stands behind Petunia with the napkin hanging from his collar. After she floats away screaming, in the close-up of Dudley the napkin stains differ and it now has a glob of white cream which he promptly wipes off and eats. (00:05:40)
Continuity mistake: As Marge is inflating, there is a close-up of her knees, as the skirt rises revealing the garters. In this close-up her cloth napkin is on the table right in front of her, though in the previous and following shots it is on the floor. (00:04:45)
Continuity mistake: While Hermione tries to coax Beaky to follow her and Harry, in the wide shot she and Harry stop, she tosses the ferret and throws her hands up in the air. In the next two close-ups their positions differ. (01:54:05)
Continuity mistake: After bowing to Buckbeak, Harry removes the chain from the ring on the wood post, with the crow sitting on it. In the close-up, the wood post with its metal hardware, and the actual black crow, all noticeably differ from the previous and following shots.
Continuity mistake: While Harry and Hermione try to coax Buckbeak to follow them, Hermione has the rope with the ferrets around her neck, which differs between shots. After Hermione tosses Beaky the second ferret, in the shot facing her she takes hold of one of the two hanging on the rope, on her left and dangles it, yet in the next wide shot she dangles both ferrets, in her hand. (01:54:15)
Continuity mistake: During the class with Hagrid, sometimes Ron has his Monster Book of Monsters under his arm and sometimes he doesn't have it. (00:33:35 - 00:34:55)
Visible crew/equipment: When Dumbledore, Fudge, and the executioner show up at Hagrid's hut (the first time), Harry, Hermione, and Ron sneak out the back then hide behind the pumpkins, and the mic pack bulge can be seen under Hermione's hoodie, at her side. (01:26:10)
Continuity mistake: In the CoMC class, when Hermione says "I think they're funny", you can see her Time-Turner outside her robes. When she turns to look at Malfoy, it's not visible anymore.
Continuity mistake: After Harry opens the front door for Uncle Vernon and Aunt Marge, Vernon walks into the living room and Harry follows him. Harry stops before he walks over the door step, but when it cuts you can see he has crossed over it. (00:01:55)
Continuity mistake: When Potter spots the dog at the bus stop he stumbles backwards and falls onto the pavement. Then we see the bus light come at him. When it cuts we see the bus come around the corner. How could the light be shining on him when the bus wasn't coming at him at all? (00:07:50)
Chosen answer: It's not known what it is. It is left to the audience's imagination of what exactly is in the room or what some witch or wizard was doing in there. This is only meant to be a humorous bit and is unrelated to the plot. It didn't happen in the book.
raywest ★