The conversation at the party includes a discussion about the unreliability of memories. When the party memories are replayed, there are subtle continuity errors between the displayed memories and the original scene.
In 2013, Robert Downey Jr. optioned this episode as a potential film adaptation by Warner Bros. and his production company Team Downey, which was to be written by the episode's writer Jesse Armstrong; the plot would have been about a man who uses a grain to repeat memories with his deceased wife, gradually learning a big secret from doing so. However, in a 2018 interview, Armstrong said that the project was in "development hell" and suggested that Team Downey's option had lapsed.
When the group of friends is discussing memories at the dinner party, part of the conversation is an implicit reference to the "Memory Wars" of the 1990s when a battle ensued between different groups of psychotherapists and members of the public with some cases of "planted memories" (particularly of incest or other sexual transgressions) surfacing. This led to many debates in psychiatric circles in North America and Europe over how memory works and to what degree organic memory could be relied upon to discern truth, particularly as time went on. It appears that this theme was at least part of the inspiration for the episode.
In this episode, the main couple Liam (Toby Kebbell) and Fi (Jodie Whittaker) have a daughter called Jodie. The name of the actress that plays Fi is Jodie Whittaker.
Rhashan Stone and Jimi Mistry starred together in Strike Back (2010) Season 2 aka Strike Back: Project Dawn together. Stone played Major Oliver Sinclair and Mistry played Latif in that season. Stone plays Jeff and Mistry plays Paul in this Black Mirror episode.