Zooey Deschanel was pregnant with her second child during filming of this episode.
This is the third time Jess assisted in a proposal. The first was Paul Genzlinger's to Jen, the second was her father's to Ashley.
While Cece and Schimdt are waiting for the elevator, Schimdt references "Sterling-Cooper". This is one of the firms on the show Mad Men, a series Schmidt is known to idolize.