When Liz is addressing the "idiots" she says, "It's idiots like you that will get 'Entourage' made into a movie." Entourage (2015) was released in 2015.
Jack's assistant's desk is visible when Banks leaves the room, and the assistant at the desk is not Jonathan. Maulik Pancholy, who played Jonathan, left "30 Rock" to star on Whitney (2011), though he returned to appear in four episodes of the series' seventh and final season.
When Jack and Devon are doing a video on the news addressing the unicorn as the new NBC mascot Jack is on TV, but in an earlier episode Jack has massive stage fright and could not complete a commercial.