Continuity mistake: In the kitchen scene Buffy takes the pizza out of the fridge and closes the door, but in the next shot the door is open and two shots later it's closed again.
Continuity mistake: After Doris from Social Services leaves Buffy's house and Spike leaves after her, he takes his lighter out of Buffy's pocket. But earlier in the episode when everyone was packing away all of Willow's magic stuff, Buffy finds Spike's lighter and puts it in one of the boxes.
Continuity mistake: As Buffy is being trained at the register, the receipt at the top of the register switches in every shot. (00:07:45)
Continuity mistake: Timothy is wearing disposable gloves as he is training Buffy at the grill, but in the shot when he puts the raw patties on the grill, he is barehanded. (00:16:15)
Continuity mistake: When Buffy is assigned to the grill, as Timothy explains the process he's wearing a short-sleeved orange/white stripe uniform. In the close-up, when he places the second patty on the grill, Timothy is wearing a 3/4 sleeve, dark blue shirt. (00:17:15)
Continuity mistake: When Timothy shows Buffy how to use the grill, there is a wood-handled grill press, and another tool, right in front of the button panel. However, after he says, "It eliminates variation," in the close-up as he presses the button, both tools as well as the transparent plastic glove he wears have all vanished. (Another mistake notes a different close-up with a disappearing glove.) (00:17:25)
Continuity mistake: The finger changes position in Buffy's hand as she picks it up. (00:23:35)
Continuity mistake: New boss Lorraine unfolds her arms twice. (00:39:05)
Continuity mistake: When Buffy's friends come visit her at work, WIllow is playing with some straws in a styrofoam cup next to the register which disappears a few shots later.
Continuity mistake: When Manny stamps Buffy's card in the time clock, he hands the time card to her with his right hand, but in the next shot facing Buffy, Manny hands the card to Buffy with his left hand.
Continuity mistake: When Buffy is being offered the 'doublemeat medley' burger by her boss, the burger looks different in close up than in the long shots. In the close shot, the burger looks overall bigger, more filling is visible and there is more lettuce sticking out.
Continuity mistake: In the scenes where Buffy is being taught how to cook the burgers, the guy that is showing her has safety gloves on. In the close-up of the guy turning the burgers and pressing the buttons, the gloves are gone, and in the next shot, his gloves are back on.
Dead Things - S6-E13
Continuity mistake: As Warren is prowling the bar, the tie camera shows a redhead walking past and then a man in a white shirt sitting at the end of the bar in the background. A moment later Warren sees Katrina sitting there. (00:08:20)
Dead Things - S6-E13
Continuity mistake: In the episode (series six) where Buffy thinks she killed Warren's ex-girlfriend, when she's at the police station, in the over the shoulder shot of Desk Sergeant, he is holding the phone between his shoulder and ear. But in the front shot of him the phone has jumped to his hand. (00:36:45)
Continuity mistake: The security tag on Buffy's new jacket shifts when Buffy first sees it. (00:12:50)
Continuity mistake: The wreath on the front door of the Summer's house disappears just after Tara tells Willow she will be doing the spell. It reappears in the next shot from outside the house.
As You Were - S6-E15
Continuity mistake: When Buffy receives her letter from UC Sunnydale it says her address is 1630 Crestview, this doesn't sync up continuity-wise with the episode The Body as she tells the 911 operator that her address is 1630 Revello. She didn't move so it's a definite mistake.
As You Were - S6-E15
Continuity mistake: When we see Xander and Anya going over the seating arrangements for their wedding, Xander is eating from a large sack of crisps. During the conversation Anya takes them off him, he takes them back and places the bag next to him. We see the bag after Xander puts it down, and in a closeup shot of him, the front of the bag is facing upwards. But when Dawn comes in, the front of the bag is facing downwards - barcode and ingredients are visible.
As You Were - S6-E15
Continuity mistake: At the beginning of the episode when Buffy offers Dawn another burger from Doublemeat Palace, she is holding the burger in her hands just before Willow comes in with her line, "Hey, workin' lady. Rough night?" The burger then jumps from the kitchen counter to Buffy's hands between shots.
Continuity mistake: When Anya is confronting Dawn about Xander's disappearance and the demon boy leaves, he walks past Dawn and her attention is on Anya but in the next shot you see him walking away from behind and his sleeve is still in the shot as Dawn turns back to Anya.
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 ★