I saw it. IMHO it was far from a documentary.
I don't raise chix, but I'm guess'n that a dark and well ventilated area is good so the birds don't get up and walk around as much?
The chix aren't obese, that would mean they are fat. We all know meat is very lean these days, also lack'n flavor, imho.(not like the good ol days, eh?
I found it interesting that they showed only the crippled birds. I do know a bit about animals. There is a certain percent that will have defects, same as the natural world. Notice they never showed the very healthy birds?
It was more of a 2hr advert, imho. But it is good to watch it and do some learn'n on your own about where your food comes from. Fresh and local as often as you can, imho.