When Dexter is looking at Philip Bosso's Personnel Record on his computer, it can be seen that the Performance Evaluations were written by a ''Cpt. Mark Harmon''. [ Mark Harmon is the name of the actor playing one of the lead roles on ''NCIS''.]
The trivia items below may give away important plot points.
This episode highly references the show Supernatural. A guest star is the actor Jim Beaver, who played a reoccurring role in Supernatural as Bobby. This is the name that the arsonist is writing on all of his crime scenes. The name of the phantom arsonist is Joseph Jensen, a reference to one of the main actors of Supernatural, Jensen Ackles.