When the kids are deleting Mr. Blank's information, his birth date is shown to be September 4, 1969. This is the exact same birthdate as Carole Finn, who played "Coil", one of the bullies in The NeverEnding Story III (1994).
When Bastian sneaks into a room with teachers' names on a whiteboard, the names listed are: Krausz, Blank, Chauvin, Galizzi, Finnegan, Oliver, Silver, and Frost.