The circumstances of Denny's death?
I haven't read the novella by Stephen King so I can't be sure, though in the book I think Denny dies in a jeep accident at an army base?
In the movie, there aren't any references to Denny being in the army, though the Michigan State University pennant in his bedroom (Gordie goes in there to get his canteen) suggests he was attending that college on a football scholarship. Do you think the jeep accident occurred in Michigan or back home in Oregon?