Where is there foreshadowing in the novel?

The old man (Bunky) saying that he knew Eldon at one time, or at least thought he did, foreshadows the revelation of the past that Eldon and the old man share. Specifically, this remark foreshadows Eldon's story of Angie and Bunky, who turns out to be the old man.

"Different fella now but I knew him good at one time. Least I thought I did."

"He smells funny," the kid said.

"He's been rinsed through pretty good."

"With that whisky?" the kid asked.

"Yes, sir. Some men take to it. I never did."

"Why not? Does it do bad things?"

The old man looked at him over his shoulder. "Keeps varmints away," he said.