This article contains spoilers for the Black Mirror Season 4 episode "Metalhead" and Season 6 episode "Demon 79." Black Mirror is no stranger to Easter eggs. Episodes frequently contain nods to previous installments in the series, though such moments don't usually signal any deeper meaning than a passing reference. For example, in the Black Mirror film Bandersnatch, a video game that appears on screen shares a title with the Season 3 episode, "Nosedive."