The building used for the CDC Zone 19 is the same building used in the 2004 TV show The 4400. In that show it was The 4400 Center.
When Clive and Dale are eating dinner, Clive mentions a criminal he arrested named Steve Reinhart. This is a nod to the song that played in the previous scene when Liv & Major start kissing in the graveyard. The song is a cover of "Can't Help Falling In Love" by Haley Reinhart.