Revealing mistake: When Buffy is walking alone into the desert, a man's legs are visible in the upper-right corner of the frame and remain visible for a second or two. (00:03:35)
Continuity mistake: Huge continuity gaffe. When Anya and Xander see Spike and the robot in the graveyard it is nightime. Xander goes back to speak to Spike almost immediately and sees Glory's followers kidnapping him. He wakes goes back to Buffy's house and from there they, again almost immediately, go looking for Glory's house - and it is the broadest of broad daylight. You could see it was still night before they left through the windows of the house. It also begs the question of how they got Spike from Glory's house back to his crypt in the sunlight since they had no blanket. (00:26:20 - 00:28:50)
Revealing mistake: When Spike is playing with the Buffybot in his crypt and has her throw him onto his bed to stake him, the shot of him landing on the bed and the Buffybot climbing on top him is portrayed by stunt doubles. The shot is then interwoven with another shot of the actual actors. But it's very obvious due to the poor editing.
Continuity mistake: As Spike is escaping Glory's apartment, the doors for the elevator that he tries to get into close in front of him twice.
Continuity mistake: When Glory punches Spike into a wall at her apartment, some blood appears on Spike's lip after he hits the wall which wasn't there before when he hit the wall.
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.
Revealing mistake: When Spike, Xander, Anya and the Buffybot are attacked by vampires in the cemetery, the grass for the cemetery moves underneath the vampires' feet as if it were a carpet. The cemetery was a sound stage and not an actual cemetery.
Tough Love - S5-E19
Continuity mistake: In season 5, 'Tough Love', Glory crushes Tara's hand causing her blood to drip onto the bench. In later shots however, there is no blood on the bench, it is clean. (00:25:40)
Visible crew/equipment: When the knights start advancing in the bottom right corner of the screen you can see a crew member wearing a red plaid shirt just standing there.
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.
Continuity mistake: The shape of the hole in the aluminium foil in the Winnebago's windshield changes shape several times throughout the course of the episode.
Continuity mistake: At the beginning of the episode when Glory gets hit by a truck, she lands on the roof of a car twice.
Revealing mistake: Watch the shot of Glory as she is hit by the truck at the beginning of the episode (easier to see in slow-mo/frame-by-frame). She isn't hit by the truck at all. It goes right past her. A simple optical illusion used in filmmaking for decades.
The Weight Of The World - S5-E21
Continuity mistake: When Glory is griping about human emotion, her arms change between wide shots and closeups. (00:23:00)
The Weight Of The World - S5-E21
Continuity mistake: When Glory challenges Dawn to name one person who can cope with life on earth, there is a close up of Dawn answering "Buffy". In this shot, the black mark (where she has been annointed) that is there before and after, has completely disappeared. (00:24:05)
Continuity mistake: In the last episode of Season 5 we see Spike thrown off the tower by Doc. Spike somehow manages to change from black trousers and boots into blue jeans and white shoes mid-air. He's back in black by the time he hits the ground. (00:35:45)
Visible crew/equipment: When Willow does her spell to save Tara, you can see the black pad Tara falls/ stands on.
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.