The closing credits end with "Shantih Shantih Shantih," the conclusion to every mantra in the Upanishads, a collection of 108 Hindu scriptures. "Shantih" was referenced several times in Alfonso Cuarón's earlier film, Children of Men (2006).
It looks like the credits are freeze frame. The only thing that moves during the credits are the passing of two airplanes. The clouds don't move during the entire credits.