When Jeff is struggling to get the bonds off when he is on the castration table, his hands and wrists are all red and there are heavy red marks all over his wrists. When Jeff confronts Hayley and he falls down (on the roof), his wrists are completely clean and no marks are seen at all.
Hayley isn't seen changing the ice, yet the bag appears full when ever lifted without the bottom being dominated by melted ice (better known as water), also for as long as the ice had been sitting on his lap, you would think that there would be a distinct discoloration, but there isn't.
The surgical gloves Hayley wears alternate from being wrist-length to arm-length multiple times throughout the film. In fact, they are long gloves which can be rolled up, a detail visible in many scenes.