Gina told Eric they are in the mafia because 'it makes them more colorfull'. In real life, Drea DeMatteo was in mafia hit show The Sopranos from 1999 till 2006.
In the very last moment of the show, after Sara says her grandfather was born in Iceland (the only country left to check off for lovers), Joey produced a map with pins stuck into it. Iceland already has been pinned.