It is stated that Charon is the only moon of Pluto. Since this episode was written, four more of Pluto's moons have been discovered, two of which were discovered in summer of 2005, before the show premiered but likely after it was already written and filmed.
This episode marks the debut of Jennifer Jareau.
The real name of "The footpath killer" is never revealed.
First appearance of A.J. Cook as, Jennifer "J.J." Jareau.