Other mistake: After Rey and BB-8 escape the sand worm, she throws it a piece of junk to eat, and it catches the junk in its teeth. As it slowly moves away, in several frames, the animation blocking doesn't match up right, where the top tooth holding the junk at several points is not holding the piece of metal at all. Instead, it shows the top of it suspended in the gap between two teeth and not secure. (00:02:23)
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