Black mirror is a reference to the effect of a TV or computer screen when switched off, giving a dark reflection of the onlooker.

From the second to the third season, the series changes from being a distinctly British show, with the exception of Jon Hamm in Season 2 Episode 4, "White Christmas," to featuring American actors in most main roles. This is because the first two seasons were produced by British production company Zeppotron, whereas seasons 3 and 4 were commissioned and produced by Netflix, an American company.

Charlie Brooker said that despite the show's themes, he loves technology. "It's not waving a fist at the iCloud," he added.

All user interfaces in the series use the font Proxima Nova.

Before the release date of season 4 was announced, Black Mirror's Twitter account had been liking tweets about the show that were posted on December 29 from the previous years, which is the release date of season 4.

In Netflix's War Machine featurette, Brad Pitt says he would do an episode of Black Mirror if there is one Netflix show he could be on.

Despite numerous references in different stories suggesting they all take place in the same universe, series creator Charlie Brooker has stated each episode is set in its own world (excluding possible sequels to specific stories).

The song 'Anyone Who Knows What Love Is' by Irma Thomas is sung by one character in each season so far : "Black Mirror" (2011) {Fifteen Million Merits (#1.2)}, "Black Mirror" (2011) {White Christmas (#2.4)}, "Black Mirror" (2016) {Men Against Fire (#3.5)} and "Black Mirror" (2017) {Crocodile (#4.3)}.

At some point in each episode, a character says the word "oi".

Hannah John-Kamen, Jerome Flynn, Faye Marsay, Donald Sumpter, Oona Chaplin, Tobias Menzies, Natalia Tena, and Francis Magee have all had recurring roles on Game of Thrones (2011).

Domnhall Gleeson, Natalia Tena and Kelly Macdonald have all had roles in the Harry Potter franchise. Gleeson was Bill Weasley, Tena was Nymphadora Tonks, and Macdonald was Helena Ravenclaw, Ghost of Ravenclaw Tower.

Jesse Plemons portrayed the antagonist on season 4 episode 1 of Black Mirror, which Aaron Paul had a voice cameo on. They also appeared together in different capacities on AMC's Breaking Bad

Though most Black Mirror episodes are standalone and make no reference to other episodes, the Season 3 finale, "Hated in the Nation," makes the second most references after Black Museum (3). Through the use of the ticker/crawler of the fictional news channel, references are made to "Men Against Fire," "White Bear," and "Playtest."

During Season 3 Episode 2 - "Playtest", when Cooper reaches the door in the house for the 'Access Point', Katie says, "Would you kindly open the door?" And later says that reaching the access point is them ensuring that he will follow instructions without question. This feels like a reference to the first Bioshock game where the main communication in the game, says "would you kindly" for each objective, and this is found out to be for the same reason as in this episode.