When Robert touches the floor with his bare feet, this flesh is being ripped of. When he touches the floor with his bare hands, nothing happens.
When Robert tries to cut the ties on his feet he uses white drums stacked to give height. When cut he slips off the drums and they roll on to their side. When we see the next view they are stacked one a top of the other again.
They are freezing but you don't see their breath...
He is supposedly freezing and is trying anything to get warm, he is wearing a hoodie but never uses it.