At one point they are speeding away in a Ford Flex. When they take a corner, it is a Chevy Tahoe. In the next shot, it is a Flex again.
The fact they outrun the tidal wave is implausible.
The in-cockpit views from the helicopter maneuvering in flight show the artificial horizon is not showing the helicopter's attitude with relation to the horizon during the banks it is performing. The altimeter shows an altitude above sea level of 840' which could be proper, but likely not in the mountainous terrain which would be several hundred feet or more above sea level given the location of mountainous regions in relationship to coastal areas in the Americas.
When in the bunker looking at the signs that had already occurred and predicting what would be likely for cancer the sign they were looking at is Pisces.
There are no mountains in Iowa.