Kylie consults three books in this story: "Galileo and his Studies of Medieval Poltergeist," "Pagan Rituals & Ceremonies," and "Magic of the Runes."
Kylie and Eduardo chase Rifkin into the IRT subway heading downtown. The IRT is the Interborough Rapid Transit company.
The character of Bruno the Pawn Broker can be spotted once more in The Pied Piper of Manhattan (1997), hiding behind a cab when the Piper first uses his music to lure away the ghosts.
Bobby, the security guard who becomes the first victim of the Runes of Kahlil will be seen again working at the Bright Wave facility in Heart of Darkness (1997) and at the United Nations Headquarters in The Sphinx (1997).