Corrected entry: The film never explains why Harry survives the Killing Curse cast by Voldemort. While the book explains that Harry survives because Voldemort took his mother's blood, the movie never does. As such, there's no reason that a curse that guarantees death would suddenly fail.
Corrected entry: In the scene where Ron and Hermione is taking the fang from the basilisk the ribs show the snake upside down. Ron takes the fang from the bottom (although it looks like the top, as it's upside down). Fangs only come out from the top.
Corrected entry: In Gringotts, when Harry and Ron cast the imperious curse they say "imperium" but should say "imperio", as said in Goblet of Fire.
Correction: They do say Imperio. It just sounds like Imperium when they say it.
Corrected entry: Right after Harry has seen Snape's memories in the pensieve, he turns around and sits down on the step and the camera can be seen reflected in the gold on the wall behind him. (01:23:20)
Correction: Reflection behind Harry doesn't resemble the camera, it's just some random distorted image of anything on the opposite wall.
Corrected entry: When Harry, Hermione and Ron jump from the dragon and Harry has his vision he says he saw Rowena Ravenclaw. It wasn't Rowena, it was Helena - and then he didn't know to look for Helena's ghost.
Correction: Harry's vision included heraldry associated with Ravenclaw House, so he surmised (correctly) that Voldemort's horcrux was an artifact that had once belonged to Rowena Ravenclaw. This turned out to be her Lost Diadem, which her daughter Helena (AKA the Grey Lady) had stolen long ago, only for Voldemort to recover and hide in the Room of Requirement.
Corrected entry: The giant chess queen from Harry Potter and the Philosopher's Stone can be seen in the Room of Hidden Things.
Corrected entry: In the '19 years later' scene Harry and Ginny have three kids, two from themselves, and one is the son of Lupin and Tonks, so that kid must be about 19 years old. Instead, both in the book and in the movie he is the same age as Harry and Ginny's other 2 kids.
Correction: Sorry, but this is incorrect. Harry and Ginny have three biological children: James Sirius (the eldest at about 13-years-old), Albus Severus (the middle child who is eleven), and Lily Luna (the youngest, aged nine). That is who is seen at the train station. Harry is godfather to Remus and Tonk's son, Teddy Lupin, who would be almost 20, but he was raised by his widowed maternal grandmother, Andromeda Black Tonks (sister to Bellatrix Lestrange and Narcissa Malfoy). Teddy was close to Harry, and often visited with him and Ginny while growing up. In the book, Teddy was at the train station seeing off his girlfriend, Victoire Weasley, Fleur and Bill's daughter. If he is at the train station in the film, he is not identified, nor is it mentioned in the film that Harry is Teddy's godfather.
Corrected entry: When the trio first enter Bellatix's Gringotts vault, Harry says 'lumos' to light his wand, yet the spell also lights both Ron and Hermionie's wands as well, which is impossible.
Correction: Harry casts "Lumos" verbally whereas Hermione and Ron cast their spell non-verbally.
Corrected entry: After the confrontation between McGonagall and Snape in the Great Hall, Snape gives up and flies off, taking the two Carrow siblings with him. But in the next two scenes, they are still lying unconscious on the floor.
Corrected entry: When the trio enters the room of requirements with Neville, there are many Hogwarts students that were a student at Hogwarts that year. Cho Chang was in there. It has been told that Cho is one year ahead of Harry. So if it were going to be Harry's 7th year, Cho shouldn't be a student, she should have graduated the year before.
Corrected entry: Cho Chang is the one who tells Harry about Rowena's tiara. However, we've previously been told that Cho is a year older than Harry, and Harry is now in year 7, which would make Cho year 8, which doesn't exist.
Corrected entry: When Harry, Ron and Hermione jump off the dragon they used to escape from the bank, Harry's glasses remain still on his head even after falling into the water from that incredible height.
Correction: Throughout the series Harry's glasses have clinged to his head in circumstances where you would think they should have fallen off. Most notably in the diving scenes during "Goblet of Fire" and "Half Blood Prince". Apparently they fit so securely that they stay on, even when diving into water.
Corrected entry: When Fred and George stand next to each other, they both appear to have two ears. However, George should be minus one. Snape had cursed it off in Deathly Hallows, part 1.
Corrected entry: Why is there snow in Hogsmeade when the trio gets there and meets Aberforth? Hogsmeade and Hogwarts are within walking distance of each other, yet there is no snow at Hogwarts.
Correction: According to interviews with Rowling, Hogsmeade is above the snow line, so there would always be snow there, no matter the weather at Hogwarts.
Corrected entry: When Harry is viewing Snape's memories in the pensive, there's a scene where Snape is talking to Dumbledore and Snape casts Lily's patronus. Dumbledore was already supposed to be dead during that scene, because the patronus went to Harry's aide at the frozen lake from Harry Potter and the Deathly Hallows part 1. Dumbledore had died in the previous movie before that.
Correction: You are confusing two different events. This scene definitely took place before Dumbledore's death, but it is not the same time as when Snape sent the patronus to Harry. Snape is merely showing Dumbledore that his patronus' shape is still a doe, the same as Lily Potter's was. It is Snape's way of telling Dumbledore that he still deeply loves Lily, even many years after her death. When Snape sent the patronus to Harry, it is much later and after Dumbledore had died. There is a brief "flashback" scene inter-cut within this showing when Harry saw the doe patronus in the woods that led him to the Sword of Gryffindor. This was not Snape's memory, but it is Harry's, and it is meant to tie the two incidents together and reveal that it was Snape who had sent the patronus and the sword to Harry in part 1.
Corrected entry: When Harry first yells at Snape in Hogwarts, he is wearing a school cloak, yet after Snape leaves he is wearing his jacket and shirt.
Corrected entry: McGonagall directs Filch to take the Slytherins to the dungeons. However, when Malfoy apparates into the castle, he grabs Goyle and Blaise Zambini while they are running. They should be in the dungeons with the rest of Slytherin House.
Correction: Just because Filch took them to the Slytherin common room doesn't mean that they stayed there. It's not as if Filch has any way to keep them in the dungeon.
Corrected entry: When the killing curse rebounds and hits Voldemort, you can't see the curse even coming within a foot of him or his wand.
Correction: The curse is killing him by breaking through the cracks in the wand, formed in an earlier scene. This is why his hand decomposes before the rest of him.
Corrected entry: In the epilogue, when the older Harry and Ginny see off their children at Kings Cross Station, there is a shot of the St. Pancras clock tower. There are two different times on the sides of the clock.
Correction: The times on both visible faces are the same, the angle of observation just makes them look different.
Corrected entry: After Harry has fallen from Hagrid's arms and reveals he is alive, Voldemort tries to cast spells his way. After this they show a shot of Lucius, then back to Voldemort. Afterwards, Draco is grabbing his mother's left hand to leave, but later when they show Lucius catching up with them, Draco is holding her right hand.
Correction: Spoiler Alert: The movie does not explain this well and it's complicated, but the curse did not "fail." Voldemort had overcome Lily Potter's protection after he added Harry's blood to his own during his "resurrection." Harry also explains to Ron and Hermione at the end of DH2 that the Elder Wand was never commanded by Voldemort, though after killing Snape, he mistakenly believed he did, and that is why Voldemort was certain the killing curse was now fatal to Harry. But unknown to Voldemort, it was actually Draco who had won the wand's allegiance when he disarmed Dumbledore on the Astronomy Tower in "Half-blood Prince." When Harry later disarmed Draco at Malfoy Manor, the wand shifted its allegiance to Harry. Recognizing Harry as its master, the wand would never harm him, even when it was wielded by Voldemort, causing his killing curse to rebound off Harry and instead strike him. In the Forbidden Forest, the first time Voldemort casts the curse at Harry, it rebounds, knocking Harry unconscious (and also destroying Voldemort's soul shard within Harry). It then hit Voldemort, who is also knocked out but survives because he has one Horcrux left. During their final confrontation, Voldemort's curse again rebounds off Harry and strikes Voldemort, fatally this time, because Neville has just killed Nagini, the last Horcrux. Voldemort unintentionally kills himself.
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