Albus Dumbledore: You must be wondering why I brought you here.
Harry Potter: Actually sir, after all these years I just sort of go with it.
After Luna and Harry meet and walk off to Slughorn's party, it pans to Draco on the stairs. It then cuts to Draco walking forward to the wall of the Room of Requirement, and at the start of the shot the actor's mark is visible on the ground behind him. See more...
The scene where Harry and Ron are taking the Hogwarts Express back home was actually filmed in Norway. See more...
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The entry you are changing the wording of is:
|Title||Harry Potter and the Half-Blood Prince|
|Original entry||In the dormitory, when Harry walks in to see lovestruck Ron at the window, Romilda's card and empty chocolate wrappers are on Harry's bed. When Harry places the Marauders map and Potions book on the dresser, the card and wrappers have changed position.|