A few of David Fincher's films show that ambient noise can be included in predominantly dialogue based dramas. Zodiac and Se7en both include the sound of cars/planes/people shouting outside of the building/room the scene is based in, none of which has anything to do with the itself or any need to be there - other than a few scenes in Se7en where Somerset is in his apartment and uses a metronome to focus on in order to forget the excessive noise outside his apartment, and the "tractor pull" comment by Mills' wife. As an example, you can hear quite loudly a plane flying over when they're both heading towards the house of the scene of the first murder, and continued planes while they're inside. In Zodiac, when Paul Avery is showing Robert Graysmith some evidence in a file room, you can hear cars drag racing outside, and a motorbike, I think. A few times watching Fincher films I've paused them, as it sounds like these noises are outside. For me, it all creates a truly immersive experience.