About the watchers/stone insect beings/fallen angels pay attention how their leader has only one eye which is a clever satan/lunar boss/illuminati one eyed fallen god subliminal.

Also the grandfather of noah was shown also to protect those watchers/demons from the humans when he was young and was shown also to have demon powers and going against the will of god just like the bad guy in this movie.(see when he knew noah was carrying out god's task and went against it by making a barren woman able to reproduce using demon like powers.)