This is the final episode for Justin Chambers (Lilly's partner Chris Lassing). From episode 5 onwards he is replaced by Danny Pino (Scotty Valens).
In this episode, Lilly confirms that she'll only work on cold cases.
Mitchell Bayes was murdered on February 3, 1990.
"Church going people" is also a line and a scene name from Mark Pellington's film, The Mothman Prophecies (2002).