When zooming in on the top of New York Magazine to the heading; Honeywell & Cootes, the next title down is Mystery vs. History: is it better not to know?, a reference to a later episode.
When zooming in on the top of New York Magazine to the heading, after title Mystery vs History, there is a reference to a past episode with Marshall's joke "Willem... Dafoe".
The Google search Marshall does has many call backs to series in-jokes including pages on him having been the largest baby born in his home county until a recent 18 lb baby was born, Bask-ICE-ball, his Vanilla Fudge nickname, being a resident of the "Dowistrepla" neighborhood, a post on a Bigfoot message board, and his all lawyer funk band, "The Funk, The Whole Funk, And Nothing But The Funk".
Also on the magazine is the teaser, "by George! Is Van Smoot Van Smitten?" George Van Smoot is the name of the character who is better known as "The Captain"