Here is another frame from the movie- just extracted. Their story is that Oswald's hands were cuffed behind his back. So, we should it, right?
Here, his right arm and forearm make a ridiculously perpendicular angle. They don't even look like human anatomy. But, the cop has to be grabbing him around his arm, so that is definitely his arm. And therefore below it must be his forearm. So, where is his left arm? Why don't we see it? Shouldn't it be at the same level? Don't the two arms have to come together and meet in the middle to accomplish the handcuff?