Perhaps I am dumb, but the ending...
The re-enactment of the screams - was that supposed to be an experiment to see if people could hear the screams and would respond? Or were the neighbors forewarned that a re-enactment was taking place? Or was it just for catharsis and dramatic effect?
The sign he posted was not specific, so I am not convinced the neighbors deliberately stayed out of the way of the filming. But he also didn't offer any follow up commentary on the fact that no one could hear or would help. Was that the assumed conclusion, or am I reading in too much?