And while boulders were originally going to crush the White house at the end of the movie, technical difficulties stopped that from happening, and it was decided that the structure would simply burn and collapse.
While shooting what would have been a prologue, they realized that the stones they were dropping didn’t register as rocks, but instead just water.
Some of the shot footage of the original opening scene was repurposed for the ending in the final cut, but all signs point to the rest being lost.