The coy-wolf or coyote-wolf hybrid is a mixture of Canis latrans and Canis lupus, which originated from the Great Plains States and has gradually migrated to the Eastern Seaboard by way of Canada.
Mulder's statement that the FBI has jurisdiction over the killing of the immediate family of a law enforcement officer is based on an actual Federal Statute: Title 18, United States Code, Section 115(b)(3). It was enacted to deter interference of a criminal investigation.
In keeping with the tradition of reusing actors, as in the early seasons when the show was filmed in Vancouver, this marks the fifth time Roger Cross (Officer Wentworth) has appeared on the series as a different character. The previous appearances were: E.B.E. (1994), Fresh Bones (1995), Pusher (1996), and Folie a Deux (1998).
A nutmegger is a life-long resident of Connecticut.
When Scully relayed her profile to Chief Strong, "When the child is under the age of five, the majority of assailants are in fact..." she was referring to a 2007 study by Sara West called "An Overview of Filicide." With respect to Filicide, murder of a child, nearly fifty percent of these homicides happen at the hands of a close family member.