The Louisville area code is 502. This episode is 5x02.
The name Hollow Creek Killer is a combination of the two serial killers from The Last Word (2006). One of the killers was called the Mill Creek Killer and the other was called Hollow Man.
The LMPD point person is named Lt. Kevin Mitchell. In 2009, LMPD's spokesperson was Dwight Mitchell.
Don Creech is the first star from Ned's Declassified School Survival Guide (2004) to guest star on Criminal Minds. The second was Devon Werkheiser, who played Ned Bigsby on the show, in which he guest starred on the season 8 episode Criminal Minds: The Wheels on the Bus (2012).