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Revealing mistake: When Han kills Williams with a final blow, he slips off his glove, which reveals a metallic hand. When the camera zooms in on his hand, you can see the fingers wobble slightly. Metal will not do that. It's either his hand or some form of rubber/silicone.

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Factual error: When Han is fighting Williams, Williams throws a side kick to Han. Then he lifts up his hand to block - supposedly a metal hand - but his hand does not move one bit. It is not possible, due to that kind of force, for a hand to not move. Even if a hand is metal, the elbow will pivot. As well as the fact that after the kick, you see Williams' face is in pain. This is not possible as he is wearing soled shoes and kicking side on.

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Audio problem: You hear a clunking of metal when Hanh hits Williams, especially when Williams throws the side kick. Clunking of metal can only be heard when metals clash. Even when metal hits rock, a different sound is made. So when flesh or bone clashes with metal, this sound cannot be made.

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