Ingrid Oliver who plays Joyce's daughter Joanna has been married to the book series author Richard Osman since 2022.
In one scene, Stephen tells Elizabeth that she "looks like the Queen". Helen Mirren (who plays Elizabeth) had previously played Queen Elizabeth II in Die Queen (2006). Jonathan Pryce (who plays Stephen) had previously appeared as Prince Philip, Duke of Edinburgh in the fifth and sixth seasons of The Crown (2016).
In the novel, Joyce mentions the idea of watching a re-run of Heißer Verdacht (1991) on TV. Helen Mirren (who plays Elizabeth in the film) had starred as the lead in that series.
On the BBC, author Richard Osman said he would be having nothing to do with the production because producer Steven Spielberg made E.T. - Der Außerirdische (1982) and if he did that he knows how to make a film. He said this was the first of four books featuring the characters in The Thursday Murder Club. The second, The Man Who Died Twice, was released in September 2021.
Richard Osman has stated that he does not wish to be too involved in the film's production, as he would rather focus on his next series of books.