Both stories involve Russian spies living in the USA under deep cover. To reinforce the connection, Geoffrey uses an altered form of the famous line from the movie when he describes the victim as "with out a doubt one of the finest human beings I've ever had the pleasure of knowing."
Holmes obliquely refers to this show when he says, "Are you familiar with the concept of invisible ink? ... I know precisely how ridiculous it sounds - you might as well have a phone in your shoe."