Continuity mistake: For most of the episode, Rey's outfit is shown having long pieces of fabric or cloth hanging off the back of her clothes like robe flaps and one in a sort of loop. Usually, when she's running or moving, these are flapping or blowing around behind her as you'd expect. Yet strangely, when she's running up to the spot where the sandworm just grabbed BB-8 and went under, the flaps are staying in front of her legs as she runs, but as she stops and the camera cuts, they are behind her again. (00:01:34)
Factual error: Through the entire episode, the nightwatcher sand worm is moving through sand like a whale does through water. It's a large, massive creature. Yet almost no sand is really displaced or moved around by it. Only a bit of shading is used and some bits of sand are shown thrown up when it surfaces, but there should be large "waves" or wakes of sand as it moves through it, especially in the faster moments. The most we see is it fills in BB-8's sand trail as it moves under it at one point. (00:00:43 - 00:02:25)
Continuity mistake: As the camera cuts and pulls back for the last shot of the episode and is zooming out away from BB-8 and Rey, the slime that was on his body has suddenly all vanished. (00:02:43)
Continuity mistake: After Rey runs her finger through the slime on BB-8's eye, he spins his head to shake off more slime from his head. Rey shields her face with her hand, then smiles at him again. Between these two moments, the slime on his lower body has moved around and changed. Notably, the white rectangle goes from having a corner sticking out of the slime to being fully covered, with more slime around it, and the slime on the right side moves further down and overlaps the dark crescent shape. (00:02:40)
Continuity mistake: When Rey goes to wipe some blue slime off BB-8's eye, there are spots of slime on the side of his head. Between shots, the two smaller spots move, with the bigger one overlapping more of the line of the white rectangle, and the smaller one moving below some of the lines on his face. Also, another orange rectangle on his face appears between the others. (00:02:33)
Continuity mistake: When the sand worms pit out BB-8, we see a shot of the bottom of a downed AT-AT Walker's foot. The "toes" are visible and are a single piece with the foot fused to it, metal on metal, and the bottom of the toe is smooth and flat. But in the last shot of the episode, the bottom of the foot is shown and here the toe is not a solid piece with the foot, connoted by a hinge and joints with space. It has grooves and details on the bottom that are not smooth. More sand also appears mounded on the foot. (00:01:51 - 00:02:44)
Continuity mistake: The head of the AT-AT Walker that Rey gets on to escape the sand worm is shown twice. In the second shot, as the sand worm is leaving, the details on top of the Walker's head have vanished. The outward square protrusions and ridges are now a flat surface on the Walker's head. And one of the parts of its front-facing gun has disappeared. (00:02:24)
Continuity mistake: After Rey gives the sand worm some junk to eat, it starts to turn around and leave while diving back down into the sand. There is a cut to a different angle as it's turning, and suddenly more of its tail is buried under the sand between shots. (00:02:24)
Continuity mistake: Once the sand worm leaves with the junk, Rey tells BB-8, "We are safe now." BB-8 then turns to look at her. Between shots, the three patches of blue slime on the side of his head change. In the first shot, they are all almost the same size as each other and shape like jelly beans. In the next shot, the top one is shaped like a guitar pick, the middle one has shrunk drastically, and the bottom one is now a triangle shape and overlapping the orange part of his head when it wasn't touching that before. (00:02:28)
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)
Continuity mistake: When Rey catches BB-8 and then runs, she scales a downed AT-AT Walker to get to safety. She runs up one of the Walker's back legs and stops at the top. Then, a couple of shots later, when the sand worm is looking up at her, suddenly the Walker's head is now in the direction she just came from. (00:02:14)
Continuity mistake: After Rey gets on top of the AT-AT safely away from the sand worm, she is holding BB-8 in her arms. He's covered with blue slime in several spots. In the next shot, when she sets him down, the large blob and smaller blobs on his head suddenly become one, and then the slime on his lower body is significantly more. (00:02:07)
Continuity mistake: When Rey is carrying BB-8 and running to grab her staff, then across the AT-AT leg, the heart-shaped lines on BB-8's "face" have disappeared. (00:02:03)
Revealing mistake: Just after Rey catches BB-8, she looks back at the sand worm. Suddenly, in this shot, you can see the rigging seam on its neck where it connects to the upper part of the mouth, which is not visible in other shots. Usually, the neck seam blends in or is not visible, but in this shot, you can see where the neck and top of the mouth are separate pieces in this 2D rig. (00:01:59)
Continuity mistake: BB-8 and Rey watch the sand worm go away after she feeds it and you can see BB-8 with the slime on him. It cuts to a different angle just before the droid asks her how she found him, and the slime spots on the side of his head change shape and size. Most notably the middle spot shrinks significantly and the bottom one over laps the edge of his head. Also between cuts Rey is suddenly much further back from BB-8. (00:02:25)
Continuity mistake: After BB-8 gets spit out by the worm, Rey runs and catches him. When it cuts to a close-up, a lot on him has changed. His antennae are reversed where the tall one was back with the short one forward then to the tall one forward, short one back. The large blue slime on the left of his head vanishes, more slime appears on the right side of his head, and the blue slime on his lower body changes and shrinks. And then the position of Rey's arms on him is different. (00:01:58)
Continuity mistake: Rey runs up along the sand worm's back and jumps off it. Between shots, the position of the worm's back is different. In the first shot, the uppermost humps of its armored shell are the highest point under its head, and its position suggests it's still partly reared up out of the sand despite the sand not being visible under it in that shot. Then, in the next shot, some humps further down its back are higher than the forward humps, and the worm is more flat across the ground. (00:01:56)
Continuity mistake: After the sand worm spits out BB-8, Rey jumps on top of it and runs across its back. In this shot, the colours on the worm are a little different. Whereas in all other shots its armoured shell was an orangish brown with tan colours, now it's an almost golden and brighter brown colour with a hint of green tint to it. The rest of its body and head are also overall lighter in colour. There has been no lighting change between shots. (00:01:55)
Continuity mistake: When the sand worm is punching up out of the sand to spit BB-8 out, several globs of sand are spraying in the air around it. In the side shot, the sand kicked up in the air has vanished. (00:01:51)
Continuity mistake: After Rey hits the sand worm with her staff, it rears up out of the sand and spits BB-8. Between shots of it coming up and then switching to a side view, suddenly BB-8's model is flipped like a mirror. Notably, the black marking on his underside is flipped, his eye and antenna are flipped around, and the blue slime on him is mirrored. (00:01:50)
