I'm not defending the pilot's actions, or what I view as egregious poor fuel planning, but as for the 4:22 in two places in the flight plan, that could just be a brain fart. I've been know to transpose numbers, this could be just that. I agree, I would never state my endurance to precision greater than half an hour.
But, as a pilot, I'm still offended by this pilot, and co pilot, that they would fuel plan so poorly, perhaps to the point of violating the regulations requiring fuel reserves.