Trivia: Harry Potter successfully battles a Troll in this movie. A character by the exact same name also does this in the 1986 movie "Troll".
Trivia: The pronunciation of "Voldemort" was changed for this movie. When J. K. Rowling wrote the books, she intended for the final "t" to be silent, just like the French phrase from which the name is derived. For the movie, however, the "t" is pronounced (probably to make it clear that the root "mort," meaning "death," was part of the name, since viewers couldn't see it written down). Evidently Rowling must have consented to this change, because she now pronounces the name that way as well.
Trivia: In order to make the school setting more real, the child actors (including Daniel Ratcliffe, Rupert Glint and Emma Watson) would often do their actual schoolwork when filming Hogwarts classes.
Trivia: During scenes where Hermione is writing with a quill, Emma Watson was actually writing things like "my name is Emma Charlotte Watson", "I am 10 years old" and (my personal favourite) "I really like this quill."
Trivia: The beds in the Philosopher's Stone were made especially for the 11 year old actors, and in the later movies they had to make new beds to fit the actors as they grew older.
Trivia: The final scene of the movie was actually the very first scene to be filmed.
Trivia: Actor Liam Aiken was originally chosen to play Harry Potter, but Daniel Radcliffe was cast instead because they wanted an all British cast, and Liam is American.
Chosen answer: There are several reasons. First, the position is cursed, so there is little reason to give Snape the job when he will not last any longer than all the previous instructors. If Snape did become the DADA instructor, something could happen to him that could result in his being harmed, having to leave Hogwarts, or be otherwise incapacitated in some way; that would render him useless to Dumbledore as a double agent. Also, Dumbledore trusts Snape, but putting him in an environment where he is teaching about dark magic on a daily basis would be too tempting and emotionally compromising to someone who had been so easily seduced by the dark side. He could possibly relapse. It would be like having a recovering alcoholic work as a bartender. Of course, he does eventually become the DADA instructor, and lasted no longer than his predecessors.
raywest ★
In the movies it is never mentioned that DADA role was cursed by Voldemort.
This is true; though it doesn't say it's not either. With trying to fit 7 long books and years worth of pages of HP information in 2 and a half hours; as long as the movie doesn't say it's not cursed, with our knowledge, there is no problem with reporting that it is. Even directors of non-book movies do this all the time; leave background information out that helps explain things they just didn't have time so they explained it behind the scenes.