First reference to Wynn Duffy's affinity for women's tennis, which is a nod to Timothy Olyphant. Olyphant is a huge tennis fan and his father, brother, and later, his daughter, got scholarships to play tennis in college. During his stint as a comedic sports reporter for a Los Angeles radio station, Olyphant frequently brought up women's tennis.
Raylan Givens not recognizing Fletcher Dix despite having a conversation with him was an effort by the writers to ensure that Givens was not seen as being unrealistically good at his job, i.e. having sixth sense when it came to bad guys.
The third series was originally going to begin with Raylan at the shooting range, but it was decided to go back and show him at the hospital, because of the seriousness of a gunshot wound.
Graham Yost cast Neal McDonough as the Northern "carpetbagger" after working with him on Band of Brothers (2001) and Boomtown (2002).