Warning: this post contains major spoilers for season six of Black Mirror.
1. In episode one – "Joan Is Awful" – Joan and Krish are deciding what to watch on Streamberry, when they hover over Loch Henry: Truth Will Out. This is the documentary that ends up being made in episode two of this season, also entitled "Loch Henry".
2. You may have also recognised Will Poulter in character as Colin Ritman in the tile for Finding Ritman. Will appeared in Black Mirror: Bandersnatch back in 2018 as Colin, a games creator who went missing during the interactive film.
3. A headline is briefly seen in the same episode which reads, "Grains Going Out Of Style". A grain is a brain implant that allows people to replay memories in their mind, and the technology drives the plot of the episode "The Entire History of You" from season one.
4. Sandy, Joan's ex-colleague, receives a text message that appears above a notification from Smithereen on her phone. Smithereen is a social media site that is featured prominently in season five, episode two of Black Mirror.
5. Mac, Joan's ex-boyfriend, is also seen scrolling on Smithereen and happens to scroll past a photo posted by Lacie Pound. Lacie is, of course, the central character in season three's first episode, "Nosedive".
6. When Joan goes to meet Mac in a bar, the song "Anyone Who Knows What Love Is (Will Understand)" by Irma Thomas is playing in the background. This song has appeared in an episode of every single season of Black Mirror so far!
7. Actor Wunmi Mosaku makes her second appearance in Black Mirror this season as Joan's Lawyer in "Joan Is Awful". She previously appeared in "Playtest" in third season as Katie.
8. During the sequence in which Streamberry CEO Mona Javadi is telling Fatima about the quamputer, we see an episode of Charlie is Awful. Charlie, obviously, being Charlie Brooker – the creator of Black Mirror.
9. In the episode "Loch Henry", there is a front page of The Scottish Sun that features a headline with the name Michael Smart in it. Michael, an MP for Tipley, is one of the main characters in the finale episode, "Demon 79".
10. On the front of Davis' laptop are stickers denoting various other shows in the Black Mirror canon. The blue bear is Waldo from "The Waldo Moment", the eye is the symbol of the Arkangel system in "Arkangel", and Tuckersoft is the video game company in Black Mirror: Bandersnatch.
11. The Callow Years – a documentary which is referenced in two episodes of this season of Black Mirror – is actually based on the Prime Minister from the first ever episode of the show, "The National Anthem". Yes, the one that fucked a pig.
12. "San Junipero" also gets a mention in "Loch Henry" during the BAFTAs sequence, in which a documentary about it is nominated for Best Factual Series.
13. During the preview for the documentary Loch Henry: Truth Will Out at the end of episode two, there are about a 1000 easter eggs! These include a references to the episodes "Metalhead", "Demon 79", "Playtest", "The Waldo Moment", "Fifteen Million Merits", and "The National Anthem".
14. In "Beyond The Sea", there's a poster in the background about what's showing in the cinema David has taken his family to. One of the items is Space Fleet, which is Robert Daly's favourite show in the season four episode, "USS Callister".
15. The "White Bear" glyph regularly pops up throughout the show, and season six is no exception. It appears in "Beyond The Sea" in an evidence photo from the murder of David's family, and it's also the symbol on the talisman Nida finds in "Demon 79".
16. The club seen in "Mazey Day" has the same name as the BDSM club from "San Junipero".
17. The actor Bo takes a photo of is famous for being in Sea of Tranquility, a fictional show that frequently crops up in Black Mirror. It has previously been referenced in the episodes "The National Anthem", "Nosedive", "Smithereens", and "Rachel, Jack and Ashley Too."
18. Anjana Vasan – star of "Demon 79" AKA Red Mirror – has appeared in an episode of Black Mirror before. According to Charlie Brooker himself, she played a space cop in the episode "Nosedive" from season three.
19. Nida Huq has the same surname as Charlie Brooker's wife, Konnie Huq.
20. The first person Nida kills is a man who Gaap tells her is a pedophile. The episode is set in the village of Tipley, which, if you were paying attention, you'll recognise from "Loch Henry". During the BAFTA sequence, another of the nominees for Best Factual Series is Suffer The Children: The Tipley Pedophile Ring. This could well be about a ring comprising the very man Nida killed!
21. The episode "Demon 79" is labelled as a Red Mirror episode, which is a sister label to Black Mirror.
22. And finally, if you were ~really~ paying attention, you might have noticed the "White Bear" glyph is also seen in Michael Smart's political party, Britannia. Honestly, this show is mind-blowing with its easter eggs and callbacks!!
