Parallel - pg. 219 "He remembered waking once on such a night to the clatter of crabs in the pan where he'd left the steak bones from the night before."
Paralleling the current time to a past experience, pre apocalypse.
Contrast - pg. 217
"Can I go swimming?
You'll freeze your tokus off.
A fairly light hearted and even comical conversation between the man and his son, something that contrasts to their normal conversations, which are very grave and sometimes depressing.
1. Why was the boy crying on pg. 218?
2. Is "her" on pg. 219 the man's wife?