Carlos Jacott, the actor who plays Richard Straley (Harriet Doyle's fiancé), was also in Anne (1998) as Ken, a demon who worked people to death. He later appeared in Serenity (2002) as Lawrence Dobson, making him what Joss Whedon calls one of his "hat-tricks" - someone who appeared in Buffy the Vampire Slayer (1997), Angel (1999) and Firefly (2002).
Cordelia's statement that she "says just what she thinks", was previously acknowledged by Buffy when she read Cordelia's mind in Earshot (1999).
Cordelia's attempt to break free of the stalker vamp by biting his arm is reminiscent of the final battle in Prophecy Girl (1997). Cordelia, trying to barricade the library door from a horde of attacking vampires, bites a vamp's reaching arm and shouts, "See how you like it!"
This episode reveals that Doyle's full name is Allen Francis Doyle. Glenn Quinn's middle name is Francis. Coincidentally, this episode aired just after The Initiative (1999) which also revealed a main character's full name (that being Daniel 'Oz' Osborne).
This episode contains the first evidence of Angel's stinginess which will become a running joke on the show. Here, he complains of having to pay for the replacement of the demon restaurant's "surprisingly expensive windows."