How does the author use foreshadowing in the novel, To Rise Again at a Decent Hour?

One example of foreshadowing can be found in the first chapter when Paul says his life really begins when he meets with Al Frushtick for the first time. At the end of the chapter, Al says that both he and Paul are Ulms. Paul says that many of his patients say “funny things” while under the influence of gas. He then says that he “didn't think anything of it,” and the chapter ends with those words. The author is making certain that the reader remembers this encounter when Al becomes an important character later in the story.