Ragnarok is the end of the world in Norse mythology. Unlike Judeo-Christian and other beliefs, Norse Ragnorok is the end of everything - people, nature, the earth, sun and the gods.
At 13:45 the Hidden One says "Impossible." to which Crane replies "No, just highly improbable.". These two lines of dialogue are directly from Douglas Adams' "The Hitchhikers Guide to the Galaxy".
At 34:47 when Crane speaks of Abbie saying "... She is, and will forever be, ours..." he is echoing Spock's farewell to Kirk "I have been, and forever shall be, your friend."