Other mistake: When Robin Wood is burying Jonathan, Jonathan's face flinches when the first heap of dirt lands on his legs.
Once More, With Feeling - S6-E7
Audio problem: In the episode 'Once More, With Feeling', when Anya sings her first few lines of the song 'I'll Never Tell', you can still hear Xander talking about omelettes in the background, but for the last few lines he speaks (from 'I could do an omelette' onwards) you can see over her shoulder that his voice is dubbed. (00:13:10)
Continuity mistake: When Willow is interrogating Jonathan, she makes a comment about how he resented being pushed around. In the first shot, she's facing him. It then cuts to the opposite angle, and she's facing sideways. Then, in the very next shot, she suddenly turns 180 degrees between cuts after walking by him.
Continuity mistake: Towards the end of the episode, when Buffy lands on the school bus she's wearing pointed toe pink shoes, but in the next shot where she's jumping off the bus roof, she's wearing brown Timberlake boots. (00:39:11 - 00:39:40)
Welcome To The Hellmouth (1) - S1-E1
Continuity mistake: The scene where Xander is on his skateboard, he becomes distracted seeing Buffy walk up the stairs and accidentally hits the pole. When the camera pans back, you can see Buffy is out of view, and is nowhere to be seen. Because she was still at the top of the stairs when Xander hit the pole, you should have been able to see her walking in the background.
Visible crew/equipment: Buffy and the gang are in the waiting room after being told the cause of Joyce's death. After Willow asks "Why don't we sit down?" the camera pans from right to left and the camera focused on Dawn becomes visible at screen left. Some frames later it appears again as Dawn leaves to "pee" and the camera zooms out. (00:32:55)
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 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: 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)
Never Kill A Boy On The First Date - S1-E5
Continuity mistake: When the vampire breaks the glass with his head, the remaining glass disappears.
Visible crew/equipment: There's a boom mic visible when Cordelia is talking to Harmony and the other Cordettes. It's the first scene in the alternate universe and they're standing inside a classroom of Sunnydale High (Cordy says something about going to the Bronze).
Revealing mistake: In Xander's dream, when he climbs into the back of the ice cream van, for a split second before the window goes out of view the backdrop cuts out and the blue screen is visible. Only visible in widescreen version.
Continuity mistake: When Willow shows up at Oz's house to talk, her hair keeps switching back and forth between being behind her back or in front of her shoulders.
Continuity mistake: Towards the end of the episode, during Buffy's fight with the Turok-Han, at the construction location, her shoes are very obviously some sort of practical flat shoe, but during her speech afterwards, she is wearing fashion boots with heels.
Revealing mistake: Right at the beginning of the episode just before we see Warren squirt Jonathan with water, we see Buffy on one of their security cameras. The footage of her is pre-recorded as the progress bar for QuickTime Media Player is visible at the bottom of the screen. The window was moved down to hide this fact, but not far down enough to hide it completely.
Continuity mistake: After Buffy decides not to take the antidote to the demon's venom, we cut to a scene at the mental institution. The doctor talks to her about ridding her mind of the things that support her "hallucinations". As he talks to her about this, the position of his hands change from pressed together in front of him to in his pockets between shots.
Visible crew/equipment: At the beginning of the episode after the Buffybot kills the remaining vampires and the rest of the gang is grouped together, the shadow of a boom mic can be seen below a tall gravestone behind Giles, far right of the screen.
Continuity mistake: When the gang are fighting Glory's minions, one of them knocks Giles to the ground and then tries to choke him. As Giles hits the ground he lands facing downwards so we can't see his face. But when the minion is chocking him in the shot immediately afterward, he is suddenly facing upwards.
I Was Made To Love You - S5-E15
Audio problem: When Spike arrives at the magic shop with a burning blanket over his head, he throws it to the ground and stomps on it, yelling, "Fire! Fire!" As he yells "Fire! Fire!" however, his lips aren't moving.
Visible crew/equipment: When Ben arrives in his car and discovers the Knights of Byzantium, the shadow of a camera on a crane can be seen in the bottom left corner of the screen as he pulls up.
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.