"The janitor who saw them later identified the man as Raymond Fiegler, head of the MSP. He identified the young woman as Carol Gerber." A man with the initials RF was the leader of a student protest group that set off a campus bomb and killed people. Randall Flagg was known to go by other names, usually with the initials RF. Also, on page 516, Carol says, "I'm good at not being seen," she said. "It's a trick someone taught me a long time ago. The trick of being DIM." Walter sometimes was called Walter O'Dim, for his ability to fade into the background and not be seen. Walter and Randall Flagg were later discovered to be one in the same. This shows that Carol had run ins with both the good (Ted) and bad (Walter/RF) forces of the Tower.

These are probably too obvious to point out, but twice Bobby Garfield refers to "other worlds than this." The first time it's a direct quote from Jake's line when he falls in the mines in The Gunslinger. Also, there's an interesting parallel structure between the two plots that I assume must have been intentional - both Ted and Roland play a sort of adopted father figure, pretty damn near explicitly, to Bobby and Jake. Jake says this line as Roland is about to lose him, whereas Bobby says it when he's about to lose Ted. In a way, though, the loss is identical, since Ted is removed to the keystone world leaving Bobby in a "normal" one, whereas Jake went to a normal one leaving Roland in the keystone world.