I haven't seen the movie, but I believe it's crude and irreverant.
I world in a school, haven't been there long and I don't know the teacher concerned, but today I was told by several people that she has shown her class of 12-13yr old pupils the film over the past few classes. I would be furious if my DC were in this class.
I'm not sure if management know about this and I'm not sure if the school culture allows for whistle-blowing, but I am really tempted to let someone know. What to do?