Unlike a stereotypical Sci-Fi film that doesn't bother about the scientific background it uses and hence ends up as merely a fantasy movie, Interstellar digs a physics theory and proudly stands upon it.Possibly future-noble-winner Dr. Kip Thorne (LIGO project fame) wrote a book : "Science of Interstellar" providing scientific aspect of the film.
Glancing at other aspects of the film, Music by Hans Zimmer is just "beyond earth!!" The story and art of story telling by Chris Nolan is at another level.Nolan's unique way of filming in non contiguous chronological fashion gives example of his exceptional directional skills. And what to say about dialogues! Each dialogue of this picture is either essence of humanity, philosophy or highly scientific.Other than that..Cinematography, sets designing, acting(Hail Mcconaughey and company!) work as important elements to complete this film as a Masterpiece.