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I think the mysterious telephone call Gatsby receives from Chicago and Philadelphia (in chapter 9) about Gatsby foreshadowing not only his demise but Gatsby's secrets coming out and hence the end of the story.
Jordan and Nick discuss bad drivers both in Chapter 3 and Chapter 9. This directs directly to Daisy hitting and killing Myrtle in Gatsby's car.
The last sentence as Tom, Jordan, and Nick are in the car before they happen upon Myrtle is, "So we drove on toward death...". This foreshadows the next pages where Tom learns that Myrtle died, and eventually, Gatsby dies as well.