The quotation on the mantle next to Marsden (eating his grilled cheese sandwich) reads: "Knowledge unused is ignorance".
The covered vehicle in Marsden's courtyard is a 1960's Jaguar XKE Coupe. This could be a nod to Artie's 1950's Jaguar XK 140.
The receptionist of the record company, Stephanie, is also one of the Librarians. Both shows focus on artifacts that have power and unusual provenance.
At around 35 minutes there is a nighttime exterior shot showing two sides of a Chicago building. The interior lights on one side spell out 9/11. The lights on the second side show an American flag. Another building to the left shows some decorative lights in the colors red, white, and blue.
Simon Reynolds (Daniel Dickenson) is on the cover of his magazine. As Dickenson monitors Artie hacking his computer, he flips a magazine where a Simon Reynolds head shot shows a younger Simon Reynolds. Simon has an off center dimple-like impression on his chin - as the younger him on the magazine.