The video is hilarious! Love it where you guys keep waving and smiling throughout! Showing some real cajones; you have lifted the spirits of thousands. Great morale booster!
They show amazing savvy. They must have been monitoring the show (on a portable TV or something) because they knew just when to raise the sign to get it into the shot. And they kept the sign moving so it would catch the viewer's eye. It also looks they used two dummy signs to "frame" the third sign, the one with the real message. They raised the third sign right into the space between the other two, like a running back finding the hole between the linemen.
Very good work, very well coordinated. They're like the resistance engaging in small acts of sabotage against the liberal establishment.