It's always challenging when you're shooting a film. Shooting things out of order and keeping continuity on all levels is always for me the most challenging thing.
But I just think we've got such a continuity with what we're doing that most people come in and fill in the blanks. And sometimes we leave a lot of blanks to be filled.
And the continuity of our science has not been affected by all these turbulent happenings, as the older theories have always been included as limiting cases in the new ones.
In the absence of full-fledged Congressional investigations, American policymakers rarely look back. They are bound by continuity and fealty across administrations and generations.