Continuity mistake: When the earthquake happens at the start of the episode, and we see the Master celebrating, his hands instantly change positions at least twice between cuts. (Sometimes it matches perfectly between cuts other times they're in an entirely different position between cuts).
Continuity mistake: When Buffy stakes the first vampire at the beginning, in the first shot, his hands are in towards his abdomen. When the camera cuts behind him, and he falls back, suddenly they're instantly extended partially outwards to either side.
Continuity mistake: When Cordy stops kissing her boyfriend and says "What was that?" at the beginning of the episode, the lighting on Cordy's face changes completely as it cuts between the two camera angles. In the first angle, the lighting is much darker and shadowy, while in the second angle, her face is suddenly much brighter.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: After Buffy cuts herself out of her chair, she unties Cordy's left wrist. The scene cuts away to Giles, Xander, Willow and Angel. When the scene cuts back to Buffy and Cordy, suddenly Cordy's wrist is tied again. There's no indication that it was retied in the meantime.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: When Cordy and Buffy are tied up, at one point Marcie the invisible girl punches Buffy. As it cuts from a closeup of Buffy back to a wideshot, the position of Buffy's head and the expression of her face instantly changes between cuts. She goes from having her head crooked with a pained expression and her eyes half-shut to having her head straight with a shocked expression and her eyes wide open.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: When the invisible girl pushes Buffy, and she falls through the ceiling and onto a table, the position of Buffy's arms changes slightly between edits when it cuts to a high-angle shot of her knocked out. Some of the debris around her also changes position.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: This is subtle and hard to notice. When Buffy is explaining that something bumped into her in front of the school after Giles explains what it's like to be touched by a ghosts, pay attention to Xander. In the first shot, he's standing about two feet back from Buffy and his left shoulder is behind Willow. In the next shot he's suddenly much closer to Buffy and Willow is no longer in front of his left shoulder.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: When Harmony is pushed down the stairs, she suddenly goes from in front of to behind the garbage can at the bottom instantly between cuts.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: In the beginning when the Scooby gang and Giles are talking in the cafeteria and Giles asks Xander to help him, in the first shot Xander doesn't have his hand on his drink, but when the shot cuts to the opposite angle, suddenly he has his right hand grasping the dop of his drink.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: When Buffy is checking out the locker room after the credits, she starts to close one of the lockers. It cuts to the opposite angle and the locker is All The Way open, and she starts to close it a second time. The way she's holding the locker door also changes instantly between edits.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: In the beginning of the episode, when Cordelia's date is in the locker room and he talks to two other students, pay attention. There's a combination lock and a baseball bat on top of the lockers. They change positions repeatedly between cuts, getting closer and further apart almost at random depending on the shot.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: When the school-bell rings at the beginning of the episode after Cordelia talks about hitting the girl on the bike, in the first shot Willow is just starting to put her book into her backpack and is still seated. In the next shot, Willow is suddenly starting to stand up and has already put her book away.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: When Cordelia is talking about hitting the girl on a bike with her car and the bell rings, pay attention to Willow's hands. As it cuts from the front angle to the back angle, Willow's hands instantly change positions. (In the first shot, her hands are together, but in the next, her arms are crossed in different directions).
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: When Cordelia raises her hand in the class at the beginning of the episode, look at Harmony's hand on the desk next to her. Harmony's hand instantly changes position and moves about six inches to her left between cuts when Cordelia is called on.
Out Of Mind, Out Of Sight - S1-E11
Continuity mistake: This is subtle and hard to notice. When the teacher is giving a lecture in the beginning, she says "Ok, so talk to me people " and starts to turn and walk to her right. When the camera cuts, she starts to turn and walk to her right a second time. It goes by fast, so it's kinda hard to see.
Nightmares - S1-E10
Continuity mistake: When Xander, Willow and Giles go out front after Xander punches out the clown, when it changes angles as Willow says "What do we do?!", Xander goes from facing away from to facing towards Giles instantly between cuts.
Nightmares - S1-E10
Continuity mistake: During her "duet", at one point, Willow goes from facing the crowd to facing the other singer instantly between cuts.
Nightmares - S1-E10
Continuity mistake: When Willow is pushed onto the stage, the other singer goes from facing her and gesturing towards her with his hand, to facing forward with his hand down by his side instantly between cuts.
Nightmares - S1-E10
Continuity mistake: When the Scooby gang splits up and Xander walks into the decrepit hallway with debris on the floor and swastikas painted on the walls, he closes the door behind him, but a few shots later, it's suddenly wide open again.
Nightmares - S1-E10
Continuity mistake: When Buffy is confronted by the monster in the school gym, after Billy flees, the monster hits Buffy, and she falls on her back, and her legs both fly up in the air. It cuts to another angle, and her legs are no longer in the air.
Chosen answer: Angel is saying that he is still jealous and Buffy recognizes that this is his way of saying he wishes that they could be together. That is why they both smile.