This is detective Zach Nichols' final appearance. Thesp Jeff Goldblum quit the show at the end of the season, citing the uncertainty of the show. (Producers made one more go of it, without Goldblum, and ended the show after a short season 10.)
Robert Stanton (Mr. Nower) previously played the role of Dennis Griscom in episode 1.11, The Third Horseman (2002).
The final appearances of Nichols (Jeff Goldblum), Stevens (Saffron Burrows) and Callas (Mary Elizabeth Mastrantonio). Both Vincent D'Onofrio and Kathryn Erbe would return for all eight episodes of the show's tenth (and final) season.
F. Murray Abraham plays Jeff Goldblum's father in this episode, and while they are not related in real life they both do originally hail from Pittsburgh, Pennsylvania.