Appearing in a cameo, series executive producer Pieter Jan Brugge, a Dutchman, discusses the iconography and symbolic significance of 15th and 16th century Netherlandish/Dutch (Northern Renaissance and Renaissance periods) painter Hieronymus Bosch's paintings (and specifically Bosch's masterpiece "The Garden of Earthly Delights") with Harry's partner Jerry Edgar (Jamie Hector).
Bosch uses IMDb.com to research the filmography of character Annabelle Crowe (Analeis Anderson) where he discovers her alternate name (for acting credits) Anna Leah Camille.
Rocky McMurray appears as series character and Harry Bosch's former partner, Rick Jackson, in this episode. Rick Jackson is a real person and a former LAPD Detective. He retired in 2013 after 34 years with the LAPD. He has been dubbed the "godfather" to Los Angeles crime writers. Including Michael Connelly, he has helped James Ellroy and Joseph Wambaugh among others in research assistance. He has been working with Connelly for the past decade, reviewing his novels for inaccuracies and inconsistencies with LAPD policy. He was also a Technical Consultant for seasons one and two.