Every episode of Black Mirror season 7 is connected to one another through a very subtle detail that you might have missed. Though it's an anthology show, there have been plenty of hints through the years that every episode of Black Mirror exists in a shared universe. The series constantly references older episodes, such as the "White Bear" symbol that appears in Jon Hamm's White Christmas episode, and several others. Black Mirror season 7, however, added new fuel to the discussion of the show's shared universe through a subtle, blink-and-you-miss-it detail in each of the new episodes.