Parents and children watched before being invited to the Playground. Children being watched while in the Playground, aren't necessarily aware of this until they hear people talk to them over speaker systems.
One adult character carries out the orders of the main antagonist because he feels he has no other choice.
And one child character ends up turning on the other children after going through the abuse of the playground and being encouraged to act violently by his emotionally abusive father.
In multiple scenes, most from panic attacks but towards the end there's a choking scene as well as a scene where someone forces their entire fist down someone's throat
While the actual pooping is not discussed, there is a scene involving poop (consumption and self stimulation) It is meant more to flesh out the depravity of a character and can be skipped (p. 46)
Technically, yes. A character is talked about having performed experiments on unborn children, but it is not described graphically. There are no other babies/unborn children
Antagonist is portrayed as queer and eventually dies.
One child, who is frequently called the f-slur but whose sexual orientation is not known, also dies.