How does the author use foreshadowing in The Diamond Mine?

When an author employs a fluid framework for a story, in which the narrative frequently jumps around in time, passages that foreshadow or hint at the future are often not noticed by the reader's consciousness. For example, in the first part of the story, the narrator is talking to Cressida on a ship, but as she talks to her, the narrator gives a lot of background detail for the reader, going back in time to talk about other events, when necessary.