May-December real-life relationship: Dylan McDermott and Maggie Q began dating a few months prior to the October 2014 air date and became engaged in January 2015. McDermott is almost 18 years older than Q.
Kevin Bacon was originally set to make a cameo as a crossover with The Following (2013), also produced by Kevin Williamson. However, the producers decided that "one set of our psychos is enough for one universe," and scrapped the idea. When asked about future crossover episodes, Williamson shrugged and stated: "I'm sure Joe Carroll - James Purefoy in The Following (2013) - did a fair amount of stalking in his younger years."
All episodes use the same two numbers plates in all cars 4SPC....5SPC
Elisabeth Röhm plays Assistant District Attorney Amanda Taylor. From 2001-2005, she played Assistant District Attorney Serena Southerlyn on Law & Order (1990).