It might not be apparent on a first watch,but superior Omens is chock full of Easter eggs, carefully placed by showrunner Neil Gaiman and director Douglas Mackinnon. Since the display is an adaptation of the book by the same name written by Gaiman and the late Terry Pratchett, and some are in homage to them both. Others are tributes to their shared love for fellow geek properties,including some they've had occasion to work on in the past.
Source: blastr.com