Visible crew/equipment: When Nada is escaping with Holly, you can see the reflection of the film crew on the car. (00:44:15)
Dr WilsonVisible crew/equipment: After Nada opens the box and looks at the shades, if you look carefully, you can see the filming equipment reflected in the lenses.
Movie Nut
Answer: As part of the alien takeover, they're suppressing any resistance and discussion of the plot. They know there's a group, led by the preacher, who are onto the conspiracy and that they're somewhere in the camp. They destroy the camp to disburse them and prevent word from getting out.
Jason Hoffman