The hair loss prank
There is a scene in which the women set Mark up for pranks, just to torment him. One thing they do is replace his shampoo with hair removal cream. Sure enough, when he's showering, his hair starts coming out in chunks. But in all subsequent scenes, he shows no signs of hair loss whatsoever, not even a comb-over! If there were no lasting effects, it's kind of pointless. That scene should have been cut, don't you agree?
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The sun is shining... but the ice is slippery.