Goofs

After the co-pilot engages the auto pilot and starts walking out of the cockpit, the plane is shown as sharply gaining altitude. The co-pilot then lunges forward, as if the plane had taken a sharp descent.

After the truck is shot off the wheel of the plane, the plane's tire is undamaged.

The jet ordered to shoot down Teri's plane is identified by the call sign "Moondog" but his side-panel and helmet clearly indicates his call sign is "Hammer".

The plane shown being refuelled is a 747-400, yet the flight engineer manuals in the cockpit indicate a 747-200, as do shots and dialog during the remainder of the movie.

In the storm, as seen from outside the plane all the lights on the main deck are flashing on and off in unison, but inside the plane various lights flash on and off individually or in small groups.

When the pressure hull is breached, the copilot declares an emergency and requests permission to descend immediately, but Air Traffic Control says to maintain altitude due to traffic below. What should happen is that he starts the emergency descent first, then tells ATC what he's doing, and they immediately divert the other traffic to give him priority.

Due to the pressure difference between the inside and outside of a plane during flight it is virtually impossible to open a cabin door on a 747 in mid-air; it could conceivably take as much as 1000 pounds of force to even get the door open a few inches. This is an intentional part of the door design and is no secret to trained flight personnel.

A 747 is unable to maintain stable flight while inverted, and then resume level flight.

When the air pressure drops inside the plane, most of the oxygen masks fail to drop from the ceiling. Much later, for some reason, they suddenly do.

Just after Teri blocks the opening in the hull, the autopilot spontaneously reengages itself. Autopilots don't do that.

When the plane is descending into KLAX as it nears the runway threshold, a whoop-whoop siren blares in the cockpit. The pilot in the control tower trying to assist the landing immediately says that the "plane is stalled." The stall warning is either a horn, a stick shaker, or both; neither of which is sounding in the cockpit. The whoop-whoop noise is associated with the Ground Proximity Warning System. The "training pilot" in the tower would know the difference in the alarms and would not then ask for TOGA power to avoid a stall. Furthermore, he would not be concerned about a GPWS alarm while the plane is over the runway.

When the plane is flying through the storm, all of the exterior shots show the lights inside blinking on and off through the windows. However, during the interior shots, the lights are on steady; none of them blink at all.

When Stubbs kills the Marshal in the toilet and takes the handcuff keys from him, the cuffs on Stubbs' wrists are clearly already open.

The tower controller informs Teri that she is cleared on the ILS, runway 7R. A few seconds later, we see the magnetic compass showing the plane's bearing shifting from 210 to 230 degrees. Either the compass is wrong, showing the plane heading southwest, or the plane isn't aligned with the 070 localizer, to the EastNE.

After setting the fire, Ryan calls, "Teri! Teri!" yet his lips are not moving.

Air traffic control radios to the 747 to switch to emergency frequency 133.75, emergency frequency is actually 121.50.

When Teri is able to make initial radio contact with the ground, one of the female ground controllers says that they need to locate a 747-200 training pilot. However from the exterior shots of the plane one can see that it is a 747-300 (however the 747-200 and 747-300 have the same type rating, so a -200 training pilot would be relevant to a -300).