Continuity mistake: In the dormitory, when lovestruck Ron is going gaga over Romilda, he is wearing a brown sleeveless tee shirt and its tan trim has many holes. When Harry brings Ron to Slughorn, Ron is still wearing that tee shirt, but now some of the holes are gone and the rest of the holes have changed position. (01:26:50)

Harry Potter and the Half-Blood Prince (2009)
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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
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Albus Dumbledore: Take my arm. That was fun. Most people vomit their first time.
More trivia for Harry Potter and the Half-Blood Prince
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 ★