The interior shots of the airplane depict a twin-aisle aircraft. The exterior shots at the end are of a 737-800, a single-aisle aircraft.
In the final scene, the airport shuttle bus is labeled, "Sioux Falls Regional Airport Joe Boss Field". In fact, the airfield is named Joe Foss Field after the WW2 Marine Corps fighter pilot.
When the plane hits rough turbulence, the oxygen mask for the passenger next to Nathan drops down, as well as a few others. Oxygen masks aren't selective; all of the masks should've dropped at the same time.