Continuity mistake: Just before the worm bursts up from the sand in front of Rey, BB-8 is running away and then stops looking forward. In the shot with him alone, the yellow rectangle next to the heart shape on his face is lined up so the edge of it is almost right above the left edge of one of the orange rectangles under it, with the white above the orange fully. Then, in the shot with him and Rey together facing the worm, the orange rectangle has moved further away so the right edge of it lines up with the white one, with more space between the two orange rectangles closest to his face. (00:01:00)
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)
Continuity mistake: After Ray tells BB-8 to not move, we get a shot of them standing together. Suddenly, an extra line has now appeared on the heart-shaped part of BB-8's face going out from his eye. (00:00:39)
Continuity mistake: When BB-8 hears the creature come up from the sand behind him, he stops. Just before he turns around the orange rectangles on the left side of his face to being almost all uniform in shape and size, to now having two big ones on the ends and two small ones in the middle. (00:00:30)
Continuity mistake: As Rey tells BB-8 that he can stay with her, you see the droid behind her from a frontal view. When it cuts to a side angle of BB-8, the lines and details on the side of it's head close to it's "eye" change with more lines appearing, the orange rectangles at the bottom become taller, and the white rectangle box moves higher up. Also in the side view there is some black cone sticking out of what would be BB-8's "face." If it's his eye it's now suddenly sticking out way too far and isn't that extended. If it's the little censor thing that is next to his eye then it's now on the wrong side of his head. (00:00:25)
