It's quite substantial and satisfying. Not to mention that it's also beautiful and poignant and wonderful and pure cinematic rapture. Quite appropriate, it seems. And it must be noted that McKellar makes quite good use of what must have been a rather low budget. The film uses many scenes of chaos in the street and implies the sort of looting and destruction that would surely occur if the world were indeed going to end.
Every frame looks true.
There is no large budget special effects to pull this off. But it never once rings false. He also uses a great music score, calling on many forgotten 70's pop hits to flavor the film with that sort of mindless nihilistic 70's feel. That decade was particularly decadent and it all emanated from asort of apocalyptic unfaith that somehow radiated throughout the country, and in fact the world, during the time. Sort of due to the height of the Cold War but also due to the emergence of a mistrust of government due to the JFK assassination, Viet Nam and the bomb, air pollution, water pollution, noise pollution, inflation, and drugs, in particular, cocaine, the 70's had us all thinking about the end of the world.