William Petersen and Tom Noonan worked together in 1986, in the production of Manhunter (1986). In the movie Petersen was Will Graham and Noonan was Francis Dollarhyde, a psycho-killer that Petersen wanted to capture (played later by Ralph Fiennes in Red Dragon (2002)).
During the opening scene when Nick and Catherine are about to examine a body in a tour bus, the song played in the background is "Just Like You Imagined" by Nine Inch Nails. This is also the same song that was used to promote the film 300 (2006) a few years later.