James Murray (playing Chief Superintendent John Houseman) and Sarah Parish (playing Mariel Flynn) are married in real life.
Was scheduled to air in the UK on Sunday 14 March, but was delayed to avoid a scheduling clash between the start of ITV's Grace (2021) and series 6 of the BBC's Line of Duty (2012). It was finally shown on 3 July 2022 as if it were part of the Series 3 block of episodes. For this UK showing, all the scenes with Chief Supt John Houseman (James Murray) were reshot with Chief Supt Mary Ormond (Claire Skinner) in his place, to avoid continuity errors, because it was announced in Belvedere (2022) that Houseman had been replaced by Ormond. The character of Malik was also added to scenes for continuity as he hadn't appeared in the original screening.
Although the same actor is used to play Lockhart, he is wearing a different suit to the original recording.
Charlie Chambers is added to the castlist and was not in the original recording of the show playing DC Samuel Goldie.
Sarah Parish and Jason Watkins both worked together in Trollied.