I should have written it more simply:
I think the original footage showed a fairly sedate crowd.
They took a look and reallllly wanted more energy.
They waited until the event was very well finished and deserted, then in the same light had lackeys hold up cell phones, wave warms around, etc in front of an EMPTY STAGE and defined that as a PANEL or frame.
And then they stacked it with the original footage:
Voila —a much more engaged crowd, wanting to save the images for treasured posterity.
I think.....that it might not be totally nuts.
We need a CALICO cat..!