What is revealed about the character by foreshadowing? Are any developments surprising?

Character: O'Brien

Foreshadowing;

A momentary hush passed over the group of people round the chairs as they saw the black overalls of an Inner Party member approaching. O'Brien was a large, burly man with a thick neck and a coarse, humorous, brutal face. In spite of his formidable appearance he had a certain charm of manner. He had a trick of resettling his spectacles on his nose which was curiously disarming—in some indefinable way, curiously civilized.

O'Brien's tone is formidable, his facade friendly.... foreshadowing the way appearance and actions can be deceiving.