When John Prescott slides out of the plane he says to the firemen, "Everybody is out." When we see him on the television, he slides out and says, "It's clear, everybody is off."
After Deacon activates the timer, he places the device under the seat with the digital display facing away from the aisle. When the crew locate it, the display is facing the aisle.
Several shots of the aircraft taking off and landing show a hole in the left side of the fuselage near the wing. These were stock shots from another movie involving the same aircraft/airline. (see"Trivia" section)
When they are cleared to descend to 9000 ft, the captain repeats this clearance by "cleared to descend to 90", which is a flight level. You can't mix the two.
When taking off, the silhouette of a Boeing 747 is shown, apparently the one of the Oceanic flight. With a bit of attention, the paintings of a British Airways can be seen on the tail.
Several times, when the plane is in flight and cruising, the head-on view of the plane shows the leading edge flaps extended which would mean that the plane would have to be flying slowly, not cruising. On the other hand, as the plane is on the ground and supposed to be landing, and they ought to be extended, they're retracted.
When "2 Hours Later" appears on the screen and it shows the 747 in-flight in the dark the tail light highlighting the logo semi-clearly shows the Columbia logo (fictional airline from Airport 1975) even though the airline featured extensively throughout the movie is supposed to be Oceanic.
While the rest of the aircraft interior set looks authentic, the cockpit is amateurish.
The bars between the panes of glass on the windscreen are from domestic windows and the instrumentation is unrealistic.
When the captain is following instructions to open the lid, he is told not to push the blade in more than a half inch, yet he pushes it in up to two inches.
When Deacon falls to his death, he should fall vertical. Yet he ends up in the fountain many yards away.
When the Oceanic Airlines 747 is parked at what is supposed to be Sydney Airport in Australia, two trucks with the Greek inscription "Trofodosia Aerodromiou" ("Airport catering") are visible. (see "Trivia" section)
When agent is giving Piolet instructions on how to disarm the bomb he tells the Piolet to start from the left side of the box. The Piolet starts from the right hand side instead.