1. When Harry is teaching DADA, it's the same room every time. More to the point, when Harry needs to hide the Potions book, he goes to a room that has been used before. Generations of students have hidden things from Fanged Frisbees to monsters in cages (and I would like to see a story about that particular incarnation of the room, hint hint hinty hint) in that room.
The obvious conclusion to this is that the Room of Requirement can't give you exactly what you want - remember when Dumbledore needed to pee? He found a room full of chamber pots, not a room with a single, more modern appliance. More likely the door to the Room of Requirement leads to a large number of other "potential" rooms, and you get the one that best suits your needs. It may also be able to make smaller items out of thin air, or to steal them from the other rooms - Harry's whistle appeared just as he needed it.
2. However! When Draco wants to find Harry, he can do so easily. Is this because he walked past the room three times thinking "I need to find them?" or because the room was already occupied? When Harry wanted to use the room as Draco used it, he was unable to.
This part confuses me oh-so-slightly. Thoughts?
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