Inside the Tower of Terror library, is another neat little Twilight Zone reference. Among the many books you'll find in there, you will spot on a table a book with the title "To Serve Man" on a shelf if you look carefully enough. It's easy to overlook it, but this book is a reference to one of the better known Twilight Zone episodes.
The book is diagonally opposite from the preview monitor in the library on the left, itting face-up on a table. The book is a reference to the Twilight Zone episode "To Serve Man", starring Richard Kiel (Jaws of James Bond film fame) as a race of 9-foot tall beings from another planet. These beings try to befriend humans but accidentally drop a folder, which is later discovered to be a cookbook that describes how to cook humans.