How does the author use foreshadowing in The Garden of Eden?

Hemmingway's introduction os David and Catherine's marriage, as well as their names, is almost a sleight of hand. His technique makes it seem as if they have crept into the narrative by accident. The dark forces that will eventually disrupt this idyllic scene are foreshadowed when the girl declares she is the destructive type. She reveals her unconventional nature in the revealing and slightly scandalous clothes that she wears, including shorts, trousers and clinging fisherman's shirts.