Well, I really don't know how to explain it........Here is a metaphor: When you're watching his movies is like reading a book. Most books have chapters, Chapters make the storyline organize. The Scenes are structure to be introduce first, and explain later. An example is Pulp Fiction, the characters in the begining return to conclude the film. You might consider it an epilogue, but it really isn't is like a conclusion of all the events that took place in the story. That's the only thing I can think of right now. I hope it helps somehow.
WindDancer - I'm not sure if thats really how it is in Pulp. In Res Dogs its starts off with Mr Orange bleeding and then it explains what happened. And Kill Bill is kind of like that. But the beginning of Pulp isn't explained in the movie because it didn't show how the robbers got to where they are.