I haven't watched it, but I've listened to discussions about it, and from what I hear it doesn't really explain quantum mechanics all that well. For instance, I heard the movie said something to the effect that the observer actually has some effect on what he is observing merely by the fact that he is observing it, which is just not true at all. According to the Heisenberg uncertainty principle, we can't know both the position and speed of a particle, but depending on the type of observation done we can figure out either its position or its speed. It does not mean that our observation actually has any effect on the particle's position or speed, and it CERTAINLY does not mean that we can alter reality just by thinking about it (which I heard was also implied in the movie).