Black Mirror went on hiatus after its fifth series was released in 2019. Its executive producers,
Charlie Brooker and
Annabel Jones, departed from the production company House of Tomorrow and joined Broke and Bones, leading to negotiations for production rights. During this time, Brooker took a break from
Black Mirror and worked on more comedic projects. In May 2022,
Netflix announced that a sixth
Black Mirror series was in development. Broke and Bones produced the series, while House of Tomorrow's parent company,
Banijay, retained ownership. Brooker was the screenwriter for "Mazey Day". At 40 minutes, it is the shortest episode of the programme. According to Brooker, the early 2000s placed the setting before "everyone was a paparazzo" due to smartphones, where photographic evidence was much harder to forge. The first episode of the sixth series to be written was "
Demon 79", a horror story set in 1979. Brooker said this episode, labelled as
Red Mirror, helped him find a new perspective for the series, closer to "people are fucked up" than "tech is bad". In writing "Mazey Day", Brooker considered "
The National Anthem", the first episode, which "was obviously designed to be startling and surprising and weird". A
Red Mirror title sequence for "Mazey Day" was made, but Brooker eventually chose the
Black Mirror opening titles to conceal the supernatural twist. As of April 2025 the title has since been changed from
Black Mirror to
Red Mirror in the episode's opening sequence on Netflix.
Casting and filming First reports in July 2022 revealed the casting of Zazie Beetz, Clara Rugaard and Danny Ramirez, who played Bo, Mazey Day and Hector, respectively. The director was
Uta Briesewitz. Beetz said filming took place in June 2022. The local newspaper
Diario Sur reported in that month that a
Black Mirror episode was being filmed in the Spanish
province of Málaga, under the name "Red Book". Locations included
Marbella,
Estepona and the Loasur studios in
Coín. Running through the woods at night felt dangerous, Beetz reported, though some scenes set at night were filmed during the day.
Framestore worked on visual effects for the werewolf, including
rigging for a digital double of Rugaard transforming into the creature. The werewolf's teeth underwent many iterations and a dedicated system for bones breaking and shifting was developed. The company NVIZ provided
compositing of graphics such as computer and television screens and worked on redesigning Málaga backgrounds to resemble Los Angeles. The soundtrack was composed by Ariel Marx and released on 21 July 2023. , subject of
Smash His Camera According to Beetz, the actors improvised slang and cultural references to the era. The attitude of paparazzi to young female celebrities in 2006 was considered. Beetz said Bo had self-loathing and chose not to empathise with people more privileged than herself. The episode uses the supernatural in place of technology, but Beetz said it led to "the same exploration of the human condition". in 2021 Rugaard said that Mazey "just wants to exist in the world undisturbed". However, she had unwittingly entered a
Faustian bargain where her acting success brought her into the public eye. Though she is commoditised and has fans who worship her, Mazey is lonely. Rugaard said that, as a werewolf, Mazey gets to regain control. == Analysis ==