 "Nana's Party" was the first episode of Inside No. 9 to be written by the programme's creators Reece Shearsmith and Steve Pemberton. BBC producers felt the episode worked as the opening episode of a sitcom, but Pemberton and Shearsmith were not happy to develop the idea into its own series, given the events of the plot. As such, the script was shelved, and revisited during planning for Inside No. 9's second series. A number of changes were made from the original script when the concept was revisited. For example, a paramedic was added to the opening scene in order to add a sense of danger and foreboding, and the character Angela's "borderline OCD" was accentuated.
