When the pilots are being briefed about the situation, the general states that the aircraft is 20 minutes from reaching Cleveland. But when the SR-71 gets on the air, it has an ETA on 35 minutes to have a visual on the jet, this means that the Jet would have reached Cleveland, long before they get there. Also when the general calls the air force base, he asks for a squadron of F-15 fighter jets, but what takes-off afterwards is in fact F-16. Which can be seen, easily, on the single-engine.
At the beginning of the film, when the plane is - according to the pilot - flying at 25,000 feet, the landing gear is down and the flaps are extended. This is the typical landing situation (low speed) and not cruising speed.
The pilot would not address 'central tower' as this is a ambiguous term. They would address ATC (Air Traffic Control) or by a coded name for ATC relevant to the particular city with which they are communicating.
In the 30th minute and later the Boeing 737 takes has no airline name on the plane nor an ID number on the tail, which are mandated by the IATA.
The DevAir 747 seen throughout the movie is actually the "City Of Everett" N747001 BOEINGS first 747 off the production line.
In the 64th minute, the oxygen masks on the plane do not automatically employ.
And the list goes on. When the Secretary of Defense is on the phone, the establishing scenes before they dissolve to his office is of the U.S. Capitol Building. Then a brief shot of the White House. The only building NOT shown is the Pentagon.
In the 7th minute during the Devair Industries press conference, there are nine members in the audience. The Devair spokesman Charles addresses them as "Ladies and gentleman, treasured investors, esteemed colleagues and members of the press." Again, there are nine people in the audience.
In the opening scene, as the pilots attempt a landing, they inform the control tower that they have no engines. Yet in the wide shots as the plane passes overhead, the only audio is the whine of jet engines.
At the LAX Airport scene, Skoda Fabia cars are visible, showing that it is footage from an European Airport, as Skoda cars are not sold in North America.