Corrected entry: In the scene after Ron destroys the locket, he tells Harry "Only three Horcruxes left". There are seven horcruxes and only three have been destroyed, so there would really be four left.
Corrected entry: When all the Harrys say "Wow. We're identical.", they all sound like Harry. However later we hear a girl's voice say "Look away, I'm hideous" when they're changing clothes. Also, in The Chamber Of Secrets, when Harry and Ron take Polyjuice Potion, they still have their voices and Harry says, "You still sound like yourself. You need to sound more like Crabbe."
Corrected entry: When Harry and Hagrid are driving onto the road, it appears they are going the same way as the traffic, but suddenly it changes and they are going the opposite way (see 14.54-15.15 mins).
Corrected entry: Early in, after everyone who has taken the potion changed into Harry look-a-likes and they all set off for the Burrow, you see a shot of Mad Eye on his broom coming up next to Harry and Hagrid, but Mundungus Fletcher was never on the broom with him, as they discussed before leaving Privet Drive.
Corrected entry: In the scene at the beginning of the movie with Hermione in her bedroom it is raining as shown through her window. But when she leaves her house and walks down the street, it is clear that it is not raining and that it has not been raining at any time recently, due to the dry street.
Corrected entry: When Harry is about to jump in the lake, he places Hermione's wand at the edge of the hole in the ice. When he jumps in, the hole in the ice broadens. Based on the original placement of the wand, it would have fallen into the water, but Harry doesn't appear to retrieve it. He has the wand again when he and Ron return to their camping area.
Corrected entry: When Bathilda Bagshot changes into the snake (Nagini) when Harry and Hermione have come to visit her, Hermione cast 1 or 2 spells who both affect Nagini. But because Nagini is a horcrux she shouldn't be. In the second part of Deathly Hallows at the great battle, Nagini is trying to kill Hermione and Ron just before Neville cuts her head off. At that moment Ron is casting a spell, but Nagini is not affected and just goes on like he should be. Also when Hermione trows a stone to Nagini, she isn't affected.
Corrected entry: During the beginning at Malfoy Manor, Voldemort uses his wand to glide Charity Burbage over the table until she is very close to its end. He murders her, and she falls onto the table, very near to Voldemort, and where Draco Malfoy is sitting. However, when Nagini crawls onto the table, she slithers well past Draco, where the body is supposed to be lying, and lunges for the kill. (00:08:55)
Corrected entry: In the ending credits, when they show the names of the students going to Hogwarts on the train, there are two names that should not be there: Cho Chang and Katie Bell. Both of them graduated the previous year. The first time code is for the train and the second is for the credits. (00:46:00 - 02:19:10)
Corrected entry: When Lupin says "Voldemort" in the Burrow after they rescued Harry, shouldn't Death Eaters have arrived? The name is already taboo, as proved when the trio is in the cafe after the wedding.
Corrected entry: In the shot in which Harry is approaching the frozen river his wand is glowing before he has a chance to say the spell "Lumos."
Corrected entry: When Harry first breaks the ice, it is a rectangular-shape. Then, after he gets undressed and comes back to the hole he made in the ice, it is oval-shaped.
Corrected entry: In the scene where Harry's friends drink Polyjuice Potion, they all put on a red shirt and a grey sweater. Only the real Harry, when talking to Mad-Eye, can be seen changing into a grey shirt. However, in the following escape scene, the real Harry is wearing the same outfit as everybody else.
Corrected entry: In the scene at the lake when Harry sees the Sword of Gryffindor, when he jumps into the water he still has his glasses on. After Ron pulls him out of the frozen lake he has to put his glasses on to see who saved him, which are lying on the ground.
Corrected entry: Near the beginning of the film, Lupin grabs Harry and asks him "What creature sat in the tank the first time Harry Potter came into my office?" to which Harry replies "A Grindylow." However, from the film's perspective, Harry never saw the Grindylow because that particular scene was omitted.