During the dinner with Tracy and Hazel, Kenneth holds up a Dharma initiative ice cream box which is another reference to Lost (2006-2010).
A picture of the Ingalls family from Little House on the Prairie (1974-1983) can be seen hanging in Kenneth's apartment.
Along with Kenneth having the Dharma Inititative ice cream, the title of this episode "The Beginning of the End" was also the episode title of Season 4 episode 1 of Lost (2004-2010).
Kenneth has drinking glasses with the Golden Girls (1985-1992) on them which also aired on NBC.
Jack plays God on the TV show they're filming. In the movie Malice (1993), Alec Baldwin's character said "I am God"