Note that a simple wristwatch functions to conclude this film in a manner similar to the spinning top in "Inception" (July 16, 2010). I love the way he shows the same bookcase at different points in time in his dimensional tunnel near the end. Nolan shows a picture of Stephen King's "The Stand" (the spine) at one point. That was a TV film in 1995.
Update: Nov. 11
Christopher Nolan has responded to his critics in an article on Uproxx, circulating now on Facebook, here. There is a book that he co-wrote with Kip Thorne, "The Science of Interstellar", which I will have to look at later. (My reading queue is pretty full.) But I guess I need to get at it because some of the science contradicts mine in my own "portfolio in progress".
As for screenwriting, I think that Nolan's technique (which his brother helped develop) for keeping track of different simultaneous "layers" of reality (dreams, space-time coincidence, fiction-v-fact, etc) is fascinating and could be taught in screenwriting courses. I think some of his ideas occur in the little 1998 film "The Last Broadcast" (Avalos and Weiler) which I saw at the University of Minnesota years ago. Of course, in Nolan's "Memento" (2001), events unfold backward in time. That's actually based on younger brother Jonathan's short story "Memento Mori". We can always ponder Benjamin Button (Dec. 29, 2008). In fact, the ideas of "The Nolan Brothers" permeate the gay sci-fi hit "Judas Kiss" (June 4, 2011), by Tepnapa.
In fact, it's appropriate to share the diagram of the "Memento" Timeline ("fabula v sujet") from Wikipedia, with original source link here. I do thinks kind of plot analysis with Microsoft Access.
Update: March 19
Here's a story about Nolan's original ending for this film.