Buck Beaver, thanks for the link to Puppet Vision Blog at puppetvision.info, one of the best links I've seen yet on the subject. I also noticed that the excellent domain "puppetmaster.info" is available for $12, I can't afford at this time.
I like the editor on this BBS very much, except that it locks down the post in an hour. I've been admin on several BBS and never saw any advantage to that. In this case I can't change something I posted to something better or more correct.
Toy stores offer tiny vacuform machines capable of very nice relief for character heads, extremely light weight, possible to make a small crowd of puppets whose minimal movements could be controlled like any hand puppet, but for example, the direction the crowd is gazing could be swept right or left in unison, linking them all together. That would be suitable to a tennis match in the foreground.
If there were but one puppetmaster, the gaze of the crowd could be varied by foot or knee control with extended cord puppet cable. I'm learning some are using bicycle cables, very durable and available everywhere. Lighter ones with strong fishing line are smaller but good enough for low force actuations like eyelids and eyes and maybe super light vacuformed faces of my example. For fish line weight cable sheaths, there will be sturdy "teflon spaghetti" available at most ham radio stores, capable of great subtlety of movements.