Continuity mistake: In Potions class, when Hermione stands before the cauldron explaining what she is smelling in her closeup, we see Neville behind her with the broad space to his right (viewer's left), just as she says, "Spearmint toothpaste". In the instant cut to the wideshot, Harry is now shoulder to shoulder with Neville, too fast for him to suddenly be standing that close to Neville. (00:34:35)

Harry Potter and the Half-Blood Prince (2009)
Ending / spoiler
Directed by: David Yates
Starring: Maggie Smith, Helena Bonham Carter, Alan Rickman, Jim Broadbent, Michael Gambon, Daniel Radcliffe, Emma Watson, Robbie Coltrane, Timothy Spall, Julie Walters, Tom Felton, Rupert Grint, Warwick Davis
Genres: Adventure, Drama, Fantasy, Harry Potter, Mystery, Romance
Harry and Dumbledore discover that Voldemort made seven Horcruxes - everyday objects that contain pieces of Voldemort's soul. Two have been destroyed, Tom Riddle's diary and a ring formerly owned by Voldemort. Harry and Dumbledore find a third - a locket in a cave. As they return to the castle, Malfoy appears and disarms Dumbledore. He tries to kill him but can't do it. Snape then appears and kills Dumbledore himself. He escapes along with Malfoy and the other Death Eaters. Harry opens the locket to find a note saying that the Horcrux is a fake, replaced by R.A.B.
moviedragon
Hermione Granger: She's only interested in you because she thinks you're the Chosen One.
Harry Potter: But I AM the Chosen One.
Question: Why is Harry not punished by Snape for almost killing Malfoy in the bathroom?
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Chosen answer: Snape wants to know how Harry knew Sectum Sempra. As shown by him using Occumelancy to see where his copy of Advanced Potion making is. But at the same time, if Snape punished Harry for a spell in a book, Harry could show it to Dumbledore, who would recognise Snape's handwriting. Additionally, Harry was certainly punished in the book - he got detention with Snape every Saturday for the rest of the term. The movie most likely had to cut this for time issues, and also perhaps because the scene is more dramatic if Snape only silently glares at him.
Ssiscool ★