This episode was also released under the title "Rest in Peace".
Mark Bonnar (Dryden) & Allison McKenzie (Akers) also worked together on Shetland (2013) as Duncan Hunter & Gail Callahan respectively.
Neil Morrissey (Morton) & Michael Nardone (O'Neill) also worked together on The Night Manager (2016) as Harry Palfrey & Frisky respectively.