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: 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)
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.
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 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.
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.
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: 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: 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.
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.
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: 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.