When Gunn asks the man hosting the party if leprechaun soufflé is next, the man replies scathingly that leprechauns don't exist. This mirrors a scene in Double or Nothing (2002), wherein Gunn compared the appearance of Skench Demons to that of leprechauns, only to be chided that leprechauns don't exist. Buffy also once asked Giles if leprechauns were real, to which he replied that he didn't think so.
Jenny Mollen originally auditioned for the role of Eve. The part went to Sarah Thompson. However, the producers liked Mollen so much, she was brought back as Nina Ash, aka Werewolf Girl.
Fred tells the group that the men who kidnapped Nina were organized, almost like military. Wesley says "An underground, monster-hunting military organization. It's happened before." He is of course referring to The Initiative in Sunnydale, which featured in season four of Buffy the Vampire Slayer (1997).
When Fred is in the limo with Nina, they're discussing Angel and how he saves people. Nina says "Guess he saves a lot of girls, huh?" and Fred replies, "Girls, guys, puppies...." The "puppies" comment is in reference to Orpheus (2003) when Faith and Angelus go into each others' minds and relive Angel's life where in the 1920s, Angel saves a puppy from being run over by a car.
Producer Jeffrey Bell says, "Nina is not becoming a regular, but there was good chemistry so we've talked about bringing her back. There are no master plans for Angel and werewolf girl but we're always open to the possibility."