During Liz's plant/baby montage, in the "Welcome Freshman" segment, the plant is wearing a Virginia (UVA) t-shirt and the Rotunda is in the background. Tina Fey is a UVA alumnus.
At the end of the tag scene, Kim Jong-Il pulling the page from his typewriter which then becomes animated alludes to the signature sign-off of Stephen J. Cannell.
Jack realizes that Scott and Avery communicate via a secret code of finger-tapping that they developed while they were prisoners together in North Korea. This is played for comedy, but is based on fact: In 1965, four American prisoners of war who were being held by the North Vietnamese in the infamous Hoa Lo Prison (known to American POWs as "the Hanoi Hilton") developed a simple but effective secret tap code to have a mode of communication unknown to their captors. One of the POWs, Air Force Captain Carlyle "Smitty" Harris, recalled an instructor who had explained a basic World War II-era five-by-five alphabet matrix code during training and, from that foundation, developed a system that enabled multiple captured Americans to communicate and maintain morale over many years of imprisonment.