Finally watched the movie after hearing it mentioned many times and was unfamiliar with a couple of the ideas presented:
1- Music. What was the deal with the whole exchange where they are playing the tones and the giant ship is playing back a symphony. I understand the basics of music and its parallels with math and why this may be an effective common tongue with NHI but is this related to a common theme or particular case in UFO lore?
2- Clouds. The clouds are swirling and forming unnatural shapes - again same question - common theme or particular case(s)?
3- The crop dusting and Alaska. The military helicopters are crop dusting with stuff that is making everything fall asleep and at one point a voice on the radio says that they will hit them with the same stuff that was used in Alaska. Anyone have any more info here?