Continuity mistake: The first time we see Hermione punch Malfoy, she turns completely away from Malfoy, then spins round and hits him. However, when Harry and Hermione watch themselves later, Hermione barely turns away from Malfoy before she punches him, and uses a different punch too. Malfoy's reaction is different as well. (01:20:05 - 01:44:50)
Continuity mistake: In Hagrid's hut, Hagrid gets something from a cage, and then he tosses it for his creature to eat. If you look closely, you'll see Hagrid *accidently* throws the item over the creature, nowhere near its mouth, yet in the following closeup the item is still flying towards the creature's mouth, and the creature gobbles it up contently! (01:21:00)
Continuity mistake: When Ron gets Scabbers back in Hagrid's hut, immediately afterwards Hermione says, "I think you owe someone an apology". Later, when future Harry and Hermione hide behind the pumpkins by Hagrid's hut, you can see Ron getting Scabbers back. So right after this Hermione should be saying, "I think you owe someone an apology." But future Harry and Hermione talk for a little bit, and when they're done, Hermione says the line. Shouldn't this line have already passed? (This can be easily checked on the closed captioning.) (01:21:25 - 01:47:00)
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 scene when the stone hits the jar of seed in Hagrid's hut, Hermione picks it up behind the shattered jar. Later when they have gone back in time, the stone lands next to the shattered jar among the spilt seeds. (01:21:30 - 01:47:00)
Continuity mistake: The first time Dumbledore knocks on Hagrid's door, you hear him knocking three times. Later when Potter and Hermione have travelled back in time you hear Dumbledore knocking three times, rapidly followed by four more knocks. (01:21:55 - 01:47:15)
Continuity mistake: 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. (01:22:20 - 01:47:25)
Continuity mistake: Outside Hagrid's when Cornelius Fudge says, "...shall be executed this day at sundown." you see Harry, Hermione and Ron hide behind some pumpkins. You can also see a crow standing on a pumpkin right in front of them. When it cuts from behind them that crow is gone. (01:22:45)
Continuity mistake: The first time we see Dumbledore tell the executioner his services are no longer required (in a shot from the stone circle), he lifts his staff and points at him. The second time (in a shot from the pumpkin patch), Dumbledore does not lift his staff. (01:23:25 - 01:50:30)
Continuity mistake: After Hermione punches Malfoy, when he and his friends run away, Malfoy says,"Not a word to anyone, understood?" just as Hermione says, "That felt good." Then Malfoy says "jumped up mudblood" when he enters the doorway and as Ron says, "Not good," Malfoy says, "Mark my words." However, when future Hermione and Harry duck and hide, the scenario differs. As Malfoy and friends run, he says everything, "Not a word to anyone, understood?" through "jumped up mudblood. Mark my words," and that's when Hermione says, "That felt good." (01:23:30 - 01:49:50)
Continuity mistake: At Hagrid's, when Harry, Ron and Hermione are there the first time in the film, there is a large birdcage, blue cup and saucer, watering can and small wood planter (with seedlings) on the windowsill. Later, when Hermione throws the first stone, as the stone flies through the window the watering can and blue cup's positions differ and the wood planter and large birdcage are gone. When she throws the second stone they are back on the windowsill. (01:24:05 - 01:52:20)
Continuity mistake: At Hagrid's, when Harry, Ron and Hermione visit the first time, the quilt lying on the chair changes position over and over again, from lying over the back of the chair, to being on the seat and so forth, until Hagrid takes it to cover his little creature. (01:24:35)
Continuity mistake: When Harry, Ron, and Hermione are in Hagrid's hut prior to Buckbeak's execution, a stone flies in the window and strikes a pot, splitting it pretty much down the middle. There are two major shards. However, when Harry and Hermione 'relive' this moment from their position among the pumpkins, the stone (thrown by Hermione) breaks the pot in a very different pattern, with smaller pieces (and more of them). Since the same event is just being played through in time again, the pot should have broken exactly the same way both times. (01:24:45 - 01:51:15)
Continuity mistake: At Hagrid's, after the jar breaks the first time, in the wide shot the toad is on the table, under the cracked pieces of jar, yet in the next close-up, the cracked pieces are gone and the toad is back on the blue plate. Later, when Hermione throws the stone, the toad is on the plate (which is farther from the jar now) as the jar breaks. (01:24:50 - 01:51:20)
Continuity mistake: When the stone hits Harry, the very first time, in the shot inside Hagrid's, he yells, "Ow!" and as he turns the blue cup touches the wood tray. In the next exterior shot, the blue cup is closer to the birdcage. (01:24:55)
Continuity mistake: When Hermione and the others are in Hagrid's hut, a rock with a swirl on it hits the pot. Later, when Hermione and Harry are reliving the scene from the exterior view, Hermione picks up the "same" rock to throw at the pot. The rock is different though, it has a bigger swirl on it. (01:24:55 - 01:51:15)
Continuity mistake: When Harry, Hermione, and Ron are hiding behind Hagrid's pumpkin patch in an attempt to hide themselves from Fudge and Dumbledore, Hermione turns around at the sound of a 'crack' in the forest, she then turns to her left and runs with the others. Later, when seen from Hermione's view reliving the past, Hermione at the pumpkins turns to her right before running with the others. (01:26:20 - 01:52:20)
Continuity mistake: In the Shrieking Shack, Harry grabs Sirius Black and throws him to the floor. There are many black marks on the floorboards, like paw prints etc. Although Sirius doesn't move when Harry first throws him on the floor, the black marks on the floorboard near Black's head change between the first wideshot of him on the floor and the following closeup and in subsequent shots as well. (01:27:25)
Continuity mistake: When Sirius, Lupin, Snape and the rest are gathered together in the Shrieking Shack, in some of the shots we see the main double doors swing back and forth, due to light gusts of wind. However, the doors' positions instantly change in some consecutive shots, even though there is no wind between the two shots. (01:27:35 - 01:30:45)
Continuity mistake: In the Shrieking Shack, Snape enters the room brandishing his wand at Lupin and Black, and both Lupin and Black back away from Snape. Lupin and Black both lean back on the big piano that's in the room. Yet when the shot changes Lupin is still backing away from Snape, and neither Black or Lupin are in front of the piano, let alone leaning back on it. (01:29:20)
Chosen answer: Fred and George used the map to aid them in their mischievous activities at Hogwarts, and probably had little interest in what their little brother was doing or who he might be with at any given time.
raywest ★