The obvious reversal of position on the validity of unprovable belief on the part of Ellie Arroway - the scientist protagonist - is foreshadowed by her embracing of a justification for believing that we're not alone - "If it's just us, it's an awful waste of space" - that puts a teleological thumb on the scales, since it implicitly assumes that there's someone who would have chosen how to use the space in the universe.
The Blu-ray's picture quality is very good - remember that this is a film that came out during the Clinton administration - but the most obvious upgrade between the DVD and the Blu-ray is in the lossless soundtrack.
The sonic rendition of the signal from outer space and of the machine that's built as a result (which looks like a giant gyroscope) sounds and feels like you're sitting on top of a gigantic out-of-balance clothes dryer. The subwoofer gets a real workout in this film. (Even the depiction of Earth's radiosphere during the opening flight away from Earth is clearer.)