Cordelia: I finally get invited to a nice place with no mirrors and lots of curtains. Hey, you're a vampire!
Russell Winters: What? No, I'm not.
Cordelia: Are too!
Russell Winters: I don't know what you're talking about.
Cordelia: I'm from Sunnydale. We had our own Hellmouth. I think I know a vampire when... I'm... Alone with him... In his fortress-like home.
Visible crew/equipment: When Angel is fighting the demon, you can see an obvious camera and two hands in the bottom right corner. (00:27:10)
Trivia: In the opening credits there is a shot of a girl standing alone on the corner of a street. This was taken from the Buffy episode "Anne", when Buffy was staying in Los Angeles.
More questions & answers from Angel
Answer: Everybody including Angel saw her. After helping them and then being left alone to talk to Angel, Cordelia says that the Powers That Be let her come back one more time to help them. After Angel gets a call saying that she died, he realises that it was her spirit that was helping them the entire time.