Continuity mistake: After Rey touches Luke's lightsaber she begins to have the vision, and when she falls to the floor the blaster is missing from the back of her belt, but after she "sees" Luke and R2 and then stands up the blaster is back again, tucked into her belt (even though Rey's having her vision of things all around her, she herself is not a vision).
Revealing mistake: While Poe leads the aerial assault on the oscillator, in the closeups of Poe and other X-wing fighter pilots, note the cockpit windows at the pilots' left and right have identical marks and scratches in their individual X-wings. It's particularly noticeable when one closeup follows another.
Continuity mistake: After Leia tells Han that she always hated watching him leave and he still drives her crazy, they hug and it cuts to the Starkiller Base. When we see Stormtroopers walking through the corridor and then Rey sneaking away, it's a flipped shot - note the Stormtroopers' backs, and Rey's hip bag and leather wrist cuff. (01:35:15)
Continuity mistake: After Rey finishes her meal beside the foot of the AT-AT and puts on the Rebel flight helmet, there's an overhead wide shot of the toppled AT-AT and we can see its front knee joint. When Rey hears the commotion with BB-8 she rushes to get her staff, which is now tall and upright in the sand at that knee joint, and had her staff been there in the wide shot we would have seen it. (00:14:45)
Continuity mistake: When Snoke orders, "If what you say about this girl is true, bring her to me," Kylo Ren is wearing his hooded cape. It cuts to Rey restrained in the holding cell, and when it cuts back to Kylo Ren rushing to the holding cell to get Rey and bring her to Snoke his cape is gone. After Rey uses the Force to trick the guard, it cuts back to Kylo Ren arriving at the cell and he's once again wearing his hooded cape. (01:30:40 - 01:31:20)
Continuity mistake: When Rey rescues BB-8 from the scavenger Teedo, the top part of Rey's outfit is crisscrossed with her right side over left, but when she shushes BB-8 it's crisscrossed with her left side over the right. Then it's back to the original way. (00:15:25)
Continuity mistake: When Poe and Finn steal the TIE/SF, both of Finn's torso harness straps have thin pieces of ridged plastic attached to them - nothing else, but when Finn wakes up on Jakku those pieces attached to the straps are entirely different. (00:20:45 - 00:24:00)
Continuity mistake: While Finn, Rey, and BB-8 are hiding in the maintenance bay to unfix the poisonous gas, when Finn lifts the floor's slotted deck plate and pokes his head out there are specific grooves at the edge on top of the plate, but no grooves underneath at the edge. The problem occurs when Chewie lifts the deck plate, and those grooves should be on the side facing him (the top side), but instead they're facing out. Then when Han tells Finn "that thing" can understand him, the grooves are gone - the top side of the deck plate is properly facing out. (00:40:05)
Revealing mistake: After Poe's X-Wing is destroyed, when BB-8 leaves the village and rolls off note all the distinctive hills and sand dunes in front of BB-8. Later, when Rey hears BB-8 with Teedo and she rushes off note the sand dunes in front of her, but after she rescues BB-8 and walks in the opposite direction those same sand dunes are now in front of them, which were also the same sand dunes in front of BB-8 when he left the village the night before.
Continuity mistake: After the First Order has destroyed the Hosnian system, including Hosnian Prime, Finn rushes up to Han and asks him where Rey is, and when it cuts to the shot of Rey running in the forest it's a flipped shot - note the leather cuff is on Rey's right wrist, etc., then in the next shot the cuff is on her left wrist as it should be. (01:11:05)
Continuity mistake: When Rey fixes the Falcon's electrical overload she pulls out blue and red wires, but just as she says, "I bypassed the compressor," in this shot facing her there are only four blue wires - no red, and then the red wires reappear with the blue. (00:51:55)
Continuity mistake: After BB-8 tells Rey that the Resistance base is located in the Illenium system, while Rey is down in the hold she asks Finn for something she needs and she holds her right arm up and points, but in the shot facing Finn it's her left arm that's up pointing as she repeatedly shouts "NO!" to him, and then it's her right arm up again. (00:38:40)
Continuity mistake: After the Starkiller Base weapon is fired at the Hosnian system, when it cuts to Finn loading gear onto Ithano's ship he stops at the top of the stairs and turns to watch the sky. The blaster's strap is beside Finn's neck slung crossbody, but in the shot from behind there's no strap near his neck. (01:10:20)
Continuity mistake: After the spy, Bazine, communicates that she's found the droid at Maz Kanata's, in the following side closeup of Kylo Ren we have a good view of the distinctive surface dents/hole on the side of his mask (his left side) and this is a flipped shot, then in the front closeup of Ren those dents/hole are now on the opposite side of his mask with different marks the other side. (00:58:55)
Continuity mistake: At the Resistance base, when the doctor's treating Chewie's injury, she's using a medical device with her right hand as she's telling him that he must be so brave, but when it cuts to the next shot it's her left hand up using the device. (01:22:55)
Continuity mistake: After the TIE fighter crashes on Jakku, the closeups of Finn waking up and releasing himself from the seat strap while he's lying on the ground are flipped shots. (00:24:05)
Other mistake: There's a typo in the end credits - an extra S in "3rd Asssistant." (02:16:30)
Continuity mistake: After Rey scrubs the salvaged parts clean, when it cuts to Rey standing in front of Unkar Plutt her shoulders are quite a bit taller than the shelf in the wideshot, but in the closeup the shelf is at Rey's chin level. (00:13:15)
Continuity mistake: While Rey's fixing the motivator, when Finn asks her if she wants to go back to Jakku because of family or a cute boyfriend, Finn's kneeling on his hands and knees, but in the next shot he's not, just as Rey tells him it's none of his business. (00:39:00)
Suggested correction: BB-8 is heading towards a background at night, the other instances are all near where BB-8 is since they are all focused around him. Rey finds BB-8, only possible if she is near the same background. BB-8 was going towards that background so can only be closer to it than before. Same goes for Finn as they crashed near where BB-8 was, since they were looking for him. They are not the exact same locations but a couple of miles apart, which produces the same background.
When Rey rushes toward Teedo and then when she walks away in the opposite direction with BB-8 the very same sand dunes are still in front of her and BB-8. Those sand dunes are also the exact same sand dunes right in front of BB-8 when he left the village. The correction states "They are not the exact same locations but a couple of miles apart", but they are in fact the exact same sand dunes and hills, certainly not miles apart, and I do not mean the general horizon "which produces the same background" (screenshots available).