A-List admirer: The episode 'Entire History of You' received rave reviews and drew the eyes.
Pitt's pitch: Downey Jr. isn't the only A-Lister with interests in the series.
Allied forces: Between the second and third series, the production switched over from British company Zeppotron to Netflix.
More than pen pals: Charlie Brooker co-wrote the episode 'Fifteen Million Merits' with his wife, Konnie Huq.
Oi, oi: In older episodes, a character said the word "oi" in every episode.
What in the world: There are many references and hints that connect episodes.
I've heard that before: There is a recurring song that appears in all seasons so far.
Recurring font: All computers and devices in 'Black Mirror' use the same font: Proxima Nova.
Casting a spell: Black Mirror' also has casting similarities with the 'Harry Potter' film series.
All too familiar: In 'Be Right Back,' a widow creates a robot husband by uploading his information to a website.
Downton lovers: In the episode 'National Anthem,' the ITV drama 'Downton Abbey' is mentioned in conversation. Actors starring in 'Black Mirror.
Memory wars: During the episode 'Entire History of You,' characters discuss memories at a dinner party.
Role reversal: Actor Domnhall Gleeson plays a human attracted to a robot in the film 'Ex Machina.