I thought the chat show lot seemed totally real, the Child welfare part didn't and I'm sure the host was in on it, but the reactions from the Audience seemed just like any other US chat show, they were acting for the TV camera's not the film.
Absolutely loved it, thought it was much funnier than Borat.
Favourite bit has to be the casting for the children and that mother agreeing to get her daughter lipo if she can't lose 10lbs in a week. I hope to god she was an actress otherwise she is a severely unfit mother!