Re: shower of red cards = Andy Rourke promo, apparently.
Those red flyers were indeed Andy Rourke DJ promo things. They were handing those out after both gigs in Oklahoma.
I'm not sure if it was the second person on the left who threw the flyers, it could have been. Or maybe someone at the front while security was distracted.
It certainly wasn't the girl in the center (Math) who Morrissey pulled up himself.