Erika Alexander (Connie Irving) is the 2nd actress to appear in the role. Michelle Hurd played the character in one episode of season 1.
Loosely based on Michael Connelly's book "Trunk Music" whilst fitting in to the rapidly developing TV version of the Boschiverse. The book title is said to be taken from a Chicago Mafia term for a killing effected in the trunk (English 'boot') of a car. Oddly, the victim in the TV version is not killed in this way.
When Bosch is shaving off his beard, his daughter tells him to shave off his mustache as well. He protests that he likes it. In the books, Bosch does have a mustache.
Titus Welliver and Jeri Ryan previously starred together in Star Trek: Voyager "Equinox".
Jamie Hector, Lance Reddick and James Ransone all appeared on the Wire.