Tim Minear insisted that Julie Benz do her own singing for the song "Ill Wind" during the scene at Caritas, the nightclub owned by The Host. She says she suffers "horrible stage fright" when trying to sing. David Greenwalt convinced her she could do it; she claims it "took a lot of courage for me to go in and do it, 'cause I am not a singer."
Production designer Stuart Blatt says, "The long hallway we built with the crosses emblazoned on the floor and embedded on the walls was one of my favorite sets we'd ever done."
Angel theorizes that because he has a soul, the siring process might be different. In Why We Fight (2004) we learn that Angel sired someone during World War II. It turns out that, though it is different, it isn't in the way Angel would have wanted.
Darla foreshadows the season four villain, Jasmine, when she is outside the Hyperion and notices jasmine flowers. She says "Jasmine, it blooms at night. I remember what that was like." The character Jasmine took the name after noticing the flowers in Shiny Happy People (2003), soon after she was born. The comparison between jasmine flowers and vampires was previously made in I Only Have Eyes for You (1998).
One of the reasons Cordelia doesn't trust Darla may be that she was the one who handed her over to Luke to feed on in The Harvest (1997).