I think they have just heavily directed it, in order to cover different subjects - peer pressure, food, school uniform etc. But it means that some of what they are saying doesn't sound genuine, which does the kids a HUGE disservice because of course it is a real problem.
It also makes you question what you're seeing. So I completely believe that the girl who hated noodles (Anya?) had to eat them frequently because that was all they had in the cupboards. But when that is shown in what seems to be a set-up 'scene' about noodles, it makes it look less believable - and left me wondering just what was in the baking dish behind them covered in foil if they had no other food in the house...
The off-script bits were much more revealing, and sadder to me. Like the little boy trying to cheer up his sister while they were getting hassle selling their possessions.