What i think was a great momentum changer and a big mistake by lebron, was , after he went totally hot scoring 7of 9 and being unstoppable for most of the first quarter, that when the time out was called he tried and missed a long three wich he obviousely missed. At that moment i thought to myself, that was not smart mr james, you're hot streak will be over and indeed he went cold.
Like when the basket seems to get bigger every time you make a shot, to me, when you feel omnipotent and you miss, that has also an effect.