In the beginning of the film, the black Toyota Prius leaves the ferry twice.
When they say that from a quake of magnitude 6 to 8, it's not a factor of two but 1 million, it's wrong. 1 unit of magnitude difference is 32 times.
So here a magnitude 8 is 1,024 times more powerful than a magnitude 6, not 1 million. That would be a difference of 4 magnitudes.