This is disinfo. Already was posted on /r/pizzagate before the ban. Basically it's confirmation bias. If you objectively listen, that is just kids being kids. Do you really think they would be doing this stuff where it could be heard outside, across the street? They would have been caught. If anything is happening at Comet's physical location, it is underground, far from where anyone could hear anything.

except the date of the film is before all the hub-bub...