In the books, Harry first sees the Diadem in the Room of Requirement, when he puts it on top of the Vanishing Cabinet so he can mark the place of where he hid his Advanced Potions textbook. And later, when he is trying to find the diadem in Deathly Hallows, he remembers that he saw something it in the Room of Requirement, because he had seen it and moved it in his 6th year. However, this scene where Harry uses the diadem as a "place-holder" is not seen in the Half-Blood Prince film. So in the Deathly Hallows film, how will Harry find the diadem? Will he just randomly go to the Room of Requirement and happen to find it? What do you guys think?