What makes this films so brilliant and terrifying is it’s low-budget nature. The fact that they had so little money to shoot with, gave it a gritty feel. Add in 16 hour days, 7 days a week because equipment was expensive plus 100 degree weather, and you’d see how absolutely drained everyone was.

Finally, they had no cleaning budget, so when the clothes got stained and soiled, they stayed that way. Hence, everything was shot in order to preserve continuity.