When Walton opens a box of Daly's belongings, a Space Fleet comic book, titled "Back for Vengeance," features a treasure trove of Easter Eggs on its cover: Waldo from The Waldo Moment (2013), a glyph from White Bear (2013), and a robotic dog from Metalhead (2017).
Series creator Charlie Brooker has not ruled out another follow-up to this. He said he might not be finished with the world of USS Callister just yet, and to "never say never."
When Nanette is looking through the complaint log (28:21), the subject line in one of the complaints is "stop pausing and watch the show".
Pink-braided gamer Pixie is listening to the song "On a Roll" by Ashley O from Rachel, Jack and Ashley Too (2019). An image of Ashley O is on the streaming service on Pixie's computer.
At 10:10, actor Yahya Abdul-Mateen II, who played Karl in Striking Vipers (2019), is shown connected to the game.