The last line of "Rock Springs" lifts the story from a well-told anecdote, complete with internal anecdotes and meaningful nods, to a story rife with unfinished business because the business is yours. It is upon you to decide what Earl does and whether he is "anybody like you." This story has always struck me for its internal stories and minor characters: Edna and the monkey, Terrel and his grandmother, the cabdriver. The narrator interprets everyone as searching for meaning, and we are likewise involved.
"Great Falls" is a picture of the horror of constant restraint. From the "double row of Russian olive trees" outside the "plain, two-story house" with "no place for the cars," we get the sense of the mother's captivity, which is a metaphor for the whole family's captivity. They cannot escape their confines and end up behaving terribly toward each other, failing to pull together in bleak times.
In both both stories, notice how Ford employs contradictory thoughts and actions to undermine and complicate his characters.