Continuity mistake: When Spike is stalking Buffy in front of her house, she somehow senses him and pulls him out of behind the tree in front of her porch. While he is being pulled out, he has no cigarette in his mouth. However in the next close-up shot, he has one (which he then quickly throws away). (00:29:55)
Visible crew/equipment: In the final scene where Buffy apologizes to Dawn, a microphone is visible in the upper left corner, from the camera angle behind Dawn, just after she says "you hurt my arm." (00:40:00)
Audio problem: When Joyce comes downstairs and comments on the breakfast Buffy made, Dawn says 'Oh, Buffy helped,' but her mouth doesn't match what she's saying.
Continuity mistake: At the beginning of the episode Buffy is thrown against a 'No Trespassing' sign and the sign is all crinkled, the vampire also punches it but later in the episode we see the same sign except that it looks brand new.
Chosen answer: He had larangitis and because of the shooting specifications they had to have him shoot the scene with a bad throat, they then re-recorded his lines and dubbed them. At various points during the scene and indeed the episode you can see him touch his throat or rub it.