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)
Other mistake: When the sand worms pit out BB-8 and the staff is tossed, BB-8 does not cast a shadow under him, while Rey's staff does have a shadow. (00:01:51)
Other mistake: After the sand worm grabs BB-8 and pulls him under, Rey runs up to the hole. Yet in this shot, it shows her running up beside and then past the hole. When in the next shot, she's shown stopping right at the hole to look down into it. (00:01:34)
Other mistake: Just before Rey jams her staff into the worm's mouth, she moves her arms to line it up. In a single frame, her left hand goes from holding the top of the staff underhanded to overhanded with no adjusting it. (00:01:06)
Other mistake: Never once does Rey leave any footprints in the sand, despite her being heavier than BB-8. And BB-8 leaves constant trails in the sand wherever he goes. BB-8 weighs approximately 40 pounds, with Ray, if going by Daisy Ridley's reported weight, is about 121 pounds. She would absolutely be leaving foot prints in the sand, especially when jumping around. (00:00:22 - 00:02:44)
Other mistake: Ray and BB-8 take off running away from the nightstalker worm. Despite rolling very fast and leaving behind a trail in the sand, BB-8 doesn't kick up any sand into the air behind him at all, despite being a ball rolling in the sand. (00:00:48)
