Continuity mistake: When Buffy is fighting Kendra the fragments of the table she is thrown onto have disappeared when she stands up again. (00:42:40)
Continuity mistake: After they finish dinner, Joyce says to Buffy that she'll have to get used to her not being around anymore because it gets so quiet. After she says this, her plate disappears.
Continuity mistake: Before the gang head over to the high school basement at the beginning of the episode, Dawn's hair is straight with curly ends. But once they're in the basement her hair is suddenly curled all over.
Continuity mistake: The white outline drawn by the coroner does not match where Kendra's body fell after being killed by Drusilla.
Continuity mistake: When Pat puts on the demon mask and punches Buffy into the bedroom door, she hits the door with her back and then falls to the floor on her face. In the immediate shot she hits the floor again, but this time on her back.
Lies My Parents Told Me - S7-E17
Continuity mistake: After Spike finishes reading his poem to his mother, the piece of paper that it's written on disappears from his hands between shots. We never hear or see him put it in his pocket and he doesn't move to put it down on the table beside him.
Continuity mistake: In the final scene with Buffy and Willow at the end of the episode, the position of Buffy's right bra strap keeps changing throughout the entire scene.
Seeing Red - S6-E19
Continuity mistake: Shortly after Spike tries to rape Buffy, he returns to his crypt and drinks a glass of vodka. Clem then arrives to watch television with him. During Spike and Clem's conversation, the position of the bottle of vodka constantly changes between shots.
Continuity mistake: When Buffy and Riley are in Buffy's room, Buffy holds Riley's hand with both of her hands and says to him, "Is there anything I can do?" But in the following shot she is holding Riley's hand with only one of her hands.
Continuity mistake: When we see Miss French make herself a bug sandwich, there are two, maybe three bugs left on her plate as she folds the bread. But when she eats the sandwich her plate is empty.
Continuity mistake: When Buffy looks into the childrens' ward the sign on the door saying 'Basement Access' disappears and reappears between shots. (00:12:00 - 00:36:15)
Continuity mistake: The time on the clock, when Buffy spots Jonathan, changes dramatically between shots.
Continuity mistake: In the scene near the end when Faith is putting Joyce's lipstick on in the mirror and taunting her, it is obvious that the make-up department forgot to put Faith's tattoo on her upper arm. It's obvious if you watch back and forth between the mirror and the shot of Faith standing and turning, there is no evidence of a tattoo that has been established Faith has in the previous season.
Chosen answer: From what we see in the series, certain girls are identifiable as potential Slayers - Kendra clearly fell into this category. The identification method is presumably mystical in nature, but the Watchers' Council are pretty effective at that sort of thing, so they're quite good at tracking down the potentials ahead of time. Not perfect, though - it does appear that Buffy herself may have slipped through the net - certainly she had no inkling of what she was until she'd already taken on the role of Slayer. It is possible, however, that this was actually cultural - an American family would hardly be likely to turn over their daughter to some strange man for 'training', so the Watchers might have chosen to keep an eye on her covertly, whereas some other cultures (like Kendra's Jamaican parents) might be more willing to believe.
Tailkinker ★