Look at the position of the bullet hole in Connally's jacket, it is below where the lapel terminates and above the top button.
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This is an approximation of the bullet hole on JBC's jacket on the day of the assassination:
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Look at the position of his wrist at z272:
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Does it really need explaining that his wrist, just below the knot in his tie, is way to high to be struck by a bullet exiting his chest at this point of the Zfilm?