Angel (1999)

Judgment - S2-E1

Continuity mistake: Right after Cordelia has her vision, Wesley goes to the whiteboard. In the "Case" column he writes "N.D.U.O." Underneath what looks like "CARYNSS" crossed out. But once they find out that it is a Prio Motu demon and Angel writes it on the whiteboard, "N.D.U.O." disappears even though Angel did not rub it off.

THGhost

Waiting In The Wings - S3-E13

Cordelia: You want I should distract him? Make with the nice-nice while you slip by?
Angel: Don't be stupid. I'm that guy and the most beautiful woman I've ever seen is making eyes at me? It's either a bachelor party or a scam.
Cordelia: What did you just call me?
Angel: I'm sorry. You're not stupid.
Cordelia: No, after that.

Trivia: Angel's human name was Liam. "Liam" is an Irish form of "William", so basically, Angel and Spike have the same name.

Epiphany - S2-E16

Question: If Angel didn't experience a "Moment of Perfect Happiness" from his night with Darla, why does he go through the same motions he went through from losing his soul before?