Factual error: The impact wave hitting the east coast is said to be faster than sound. Despite that, you still can hear the wave coming before it arrives in multiple scenes. If it actually was faster than sound, you would not hear the wave before arrival.
Suggested correction: The president claims the wave will be going at the speed of sound at first, but as it reaches the coast, it will slow down whilst rising in height. So it will not be going faster than the speed of sound anymore.





