While Jake is in the hospital waiting room he looks at the people around him including a black nurse holding a white baby. This is a homage to legendary photographer Robert Frank's photograph called "Charleston, South Carolina, 1955". The photograph depicts that same thing except in the photo they are outside rather than indoors.
Jake teaches his 2016 class about Odysseus and Calipso and Homer's "Odyssey" which is about a hero's journey after the fall of Troy. Jake's own heroic journey takes place before the fall of "Camelot", another legendary myth.
This episode takes place from April 8 to April 10, 1963 and in 2016.
This was, of course, written by Stephen King. TR Knights Character is driving Christine.