Nina expresses her disgust at Angel when she finds him about to eat "two Doublemeat" hamburgers. The Doublemeat Palace is the fictitious fast-food restaurant suspected of serving ground-up human murder victims in Buffy the Vampire Slayer (1997), where Drew Z. Greenberg --who wrote this episode--also worked as a staff writer.
This is the 1st episode that Dexter uses the phrase "Dark Passenger" which he uses throughout the rest of the series.