Which two techniques do writers employ to draw a readers attention to symbols in their stories?

Which two sentences in this excerpt from theodore dreiser my brother paul are examples of characterization that suggest paul is a superstitious person?

Akeyword should be just as confusing as the word you are trying to learn so you learn to concept them

What is implied in this sentence from mark twain's "the £1,000,000 bank-note"? i was puzzled, and wanted to discuss the matter a little further, but they didn't; so i took my leave, feeling hurt and insulted to be made the butt of what was apparently some kind of a practical joke, and yet obliged to put up with it, not being in circumstances to resent affronts from rich and strong folk.