Why does the author refer to Ben and Mark as "the tall man" and "the boy" in the epilogue?

Why did the author put the end of the story in the epilogue? After all, it does give away some of the ending, and tells that Ben and Mark will survive.

In what ways are the vampires in the book like "classic" vampires? How are they different from humans?

This story is set in 1975. The book was first published around the same time. The technologies and cultural trends from the book are authentic to what a small town would have been like during that period. How would the story have been different if it had been set in the current year (in the 21st century)?

How is Barlow different from the rest of the vampires? Why is he different from the rest of the vampires...