Which of the following would not be considered an on-the-page question? A. How many fish were there?
B. What’s the name of the fish?
C. Where did the fish swim?
D. What would I do if the fish bit me?

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.