: it appears the only person who can possibly be waving this flag is the white man in the reddish shirt standing directly behind that black man

I was wrong to dismiss, as film noise, the flickering over the head of this woman:

It
is indeed a handkerchief or scarf. However, it is nowhere near in the right position to account for the sizeable flapping object in Towner which we have been talking about.
From young Ms. Towner's position, well to the east of Mr. Bell, the woman waving the handkerchief/scarf is all but blocked by the old woman in blue. She is waving her right arm left and right, and we get a glimpse of this in Towner. And Towner also catches, over the head of the old woman in blue, a tiny bit of the flickering of the handkerchief/scarf:

The sizeable flapping object in Towner is NOT from anything out in the street. It is
in the doorway, in the most interesting spot imaginable:
