When the investigation team is still trying to figure out who could have been the murderer, one of them suggests that all the abused women could have arranged the murders--"like Murder On The Orient Express?" Then Anne-Britt, Lisa, and Magnus digress into a conversation about which Agatha Christie novel it was that that had "was one victim and lots of killers," and they continue in that vein ("You're thinking of Ten Little Indians, aren't you? You know, the one with Albert Finney on the train." "No, that's Murder On The Orient Express.") until Wallander (Kenneth Branagh) yells at them to concentrate on the murder investigation. In 2017, Kenneth Branagh directed and starred in a big-screen adaptation of Murder on the Orient Express, in the same role that Albert Finney played (Detective Hercule Poirot).
Phyllis Logan and Dudley Sutton both appear in this episode. They were co-stars in the series Lovejoy (1986) starring Ian McShane.
Sarah Smart (Anne-Britt Hoglund) & David Warner (Povel Wallander) also worked together on The Secret of Crickley Hall (2012) as Magda Cribben & Percy Judd respectively.
The Volvo that Wallander (Kenneth Branagh) drives in the episode should actually be a black Saab, at least according to the registration number MYC222 as found in the Swedish car database.
Jeany Spark (Linda Wallander) & Sarah Smart (Anne-Britt Hoglund) also worked together on episode 1.5, Spot the Difference (2011), of Death in Paradise (2011) as Emilie Saunders & Suzie Park respectively.