[Spike crashes to the floor and sits up looking furious.]
Spike: Right! We are gonna set some ground rules. Number one - don't hit me in the face. Number two - when I hit you in the face, you tell me how it feels, so I can write that on my clipboard. Number three [holds up the clipboard.] don't touch my clipboard.

Continuity mistake: After Wesley, Cordelia and Gunn sing "We Are The Champions" and Cordelia mentions tequila being evil, we see Wesley put aside some shot glasses. These glasses change position three times throughout the rest of the scene without anybody touching them.
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Answer: Due to his epiphany, Angel basically had the 'true darkness' he worked so hard to reattain ripped away from him, like his soul was after sleeping with Buffy.