Revealing mistake: At the very beginning of the episode, Lyle's reflection can be seen in the tiles on the floor in the shopping mall.
End Of Days - S7-E21
Audio problem: When Faith is in bed and talking with Buffy, she says, 'and no one else can feel it' her lips don't sync with what she's saying.
Continuity mistake: When Willow hands Giles the pages she stole from the books of ascension, initially the folded side faces to the left, with loose edges of pages to the right, then in the next shot the folded edge is now on the right. (00:36:25)
Continuity mistake: When Adam enters the cave and is talking to the vampires and then pulls the head off of one of them, watch as he falls, his head is still visible when he is falling out of frame. (00:15:25)
Some Assembly Required - S2-E2
Continuity mistake: In the episode 'Some Assembly Required' Eric takes photos of Cordelia and Buffy near the start, when he's developing them later the poses in the photos are different to the way the girls were standing at the time. (00:06:40 - 00:19:05)
Continuity mistake: When Cassie and Dawn were talking, just before Cassie got kidnapped, Cassie put her hand on Dawn's shoulder, but in the next shot, her hands were by her side.
Continuity mistake: When we see Veruca eating at the table, she reaches for a cup as we see Oz coming up behind her. The shot changes and we see her turning around and reaching for the same cup again, though she never had time to put it down.
School Hard - S2-E3
Continuity mistake: When Buffy's fighting Spike at the end of the episode, there are times when it's obvious that it's James Marsters' stunt double. Spike's hair is platinum blonde, slicked back, and all one length in the back, while the stunt double's hair is more brassy, spiked in the front, and layered in the back.
Life Serial - S6-E5
Continuity mistake: Warren switches from holding Jonathan's magic bone with one hand to two hands between front and reverse shots. (00:19:10)
End Of Days - S7-E21
Revealing mistake: When Buffy finds Faith and the Potentials in the sewers she throws an Ubervamp across the room. When we see the Ubervamp from behind you can also see the actor's blue boxer shorts sticking out of the Ubervamp costume.
I Only Have Eyes For You - S2-E19
Revealing mistake: After Buffy has entered the wasp-filled school there's a shot of the others standing outside waiting for her. In the establishing long shot if you look closely you can see they used the same shot as earlier in the episode - Buffy is standing there with them. (00:34:10)
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.
Continuity mistake: At the beginning of the episode when Buffy is fighting the demon, she stabs it and the demon lands half on top of her. When they fall to the ground, you can see a big stain on her pants where the demon touched her. But when she stands up, her pants are clean.
Continuity mistake: When Anya leads Andrew away to their station in the school, she goes from having her right arm over his shoulders to having her left arm over her shoulders between shots. She is off camera for a second, but not long enough to move to the opposite side of him and change hands.
Once More, With Feeling - S6-E7
Continuity mistake: When Buffy is singing her final song in the Bronze Tara and Anya are standing in the background watching, if you look closely you can see their hands keep changing places between shots, crossed to uncrossed and so on. (00:42:00)
The Harsh Light Of Day - S4-E3
Continuity mistake: When Buffy catches Parker talking to another girl he stands up to leave and slings his backpack over one shoulder. In the next shot it's over both shoulders. (00:34:45)
Revealing mistake: When Buffy sets the vampire alight, his face suddenly gets very shiny, showing the fireproof gel that was applied to the actor's skin. (00:37:20)
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.