Second time that real-life mother and daughter, Dame Diana Rigg (Veronica) and Rachael Stirling (Becky), have played mother and daughter. The previous was on Doctor Who (2005) season seven, episode eleven, "The Crimson Horror".
Mackenzie Crook (Andy) mentioned in an interview that while writing this series he spent a long time listening to Johnny Flynn. Crook asked Flynn to compose an original theme which you can hear at the beginning of and throughout the episodes.
Johnny Flynn, who composed the original theme of the series, made an appearance in Episode 3 (2014), as Johnny Piper.