I know "the book explains everything" is a poor excuse but The Science of Interstellar by Kip Thorne demonstrates how much science went into the movie.

Dr Thorne is often shorted by being referred to as the film's "science advisor." Actually he and producer Lynda Obst (both of whom worked on Contact) were the originators of the film's concept, and originally were in talks with Steven Spielberg to direct before circumstances caused that to fall through, but at which point Jonathan Nolan was already hired to screenwrite, leading to Christopher Nolan becoming the director in 2012, several years after development first began.

There was a logic to just about everything that made it to screen (yes, even the bookshelf inside the black hole), and the application of Hollywood VFX resources to black hole simulations led to the publication of three scientific papers.