Visible crew/equipment: When the state policemen meet for the first time, the shadow of some equipment is seen on the wall behind them. It falls and you can even hear it. (00:17:30)
Visible crew/equipment: When they find the giant nest in the desert, several parked cars and trucks are visible in the background. It is supposed to be an isolated place. (00:34:00)
Visible crew/equipment: When the policemen leaves with the girl, a crewmember's reflection is visible on their car. (00:04:15)
Answer: You fill the canvas bag with water, put it somewhere where the air can blow through, and the evaporation of the water seeping through the canvas creates cool water inside.
stiiggy