Continuity mistake: In most scenes at Bangor airport the plane (L1011/Tristar) can be seen in the middle distance from the terminal window, but in one or two scenes it's right outside blocking the view.
Factual error: When Nick "turns the pressure back on" all he does is flip his O2 regulator from normal to emergency. This would not have helped the other passengers wake up. (02:46:20)
Other mistake: When the passengers are frantically trying to refuel the jet at the Bangor airport (and Toomy is having a psychic/psychotic meltdown), everyone's attention is drawn to the collapsing power lines in the distance as the Langoliers head straight for them. Up until this point, we have been abundantly reminded that there are no odors, no sounds, no living things, no nothing except sterile, inanimate objects in the past, so the plane passengers are the only living, animate beings in this dead zone. However, as everyone looks toward the Langoliers in the distance, a flock of very animate white egrets (cowbirds) rise up from the grassy meadow in the foreground and circle once or twice for the camera.
Continuity mistake: Albert knocks Toomey out with a toaster. You can see during several subsequent shots that there is only a small amount of blood on Toomey's forehead and none at all on his face. Toomey lies there unconscious for a while, without changing position, and when he wakes up, suddenly his whole face is cut up and bloody. (01:54:00 - 01:59:05)
Other mistake: Towards the middle/end the mystery writer specifically says that on the airplane in Bangor there is electricity but in the airport there is none. However, when first arriving at the airport you can clearly see there are lights on overhead.
Factual error: Attempting to steer an airplane moving along the ground at more than 100 knots will cause the landing gear to be destroyed.
Deliberate mistake: The version of Earth that our main characters spend the story trapped in, is one individual second in the past that is identical to Earth in every way, with the only exceptions being there is no life or power. The Langoliers consume all the land in this one second and the remnants fall into a huge abyss. However, if this were like Earth, there should be thousands upon thousands of miles of soil beneath the land, but this is ignored for the sake of the plot.
Revealing mistake: When the Langoliers make a hole in the ground to stop the passengers from leaving, Brian turns the plane around so that the plane can take off from a different part of the runway. In the shot of the plane turning around, tyre marks can be seen on the ground, presumably from previous takes. (02:15:32)
Visible crew/equipment: When everyone realises Toomey is on the runway and about to run past, Bethany, Rudy, Nick, Brian and Laurel are shown going outside to stand on the top of the airstair to see him. Just as Brian steps out of the plane, part of the boom mic can be seen entering the frame to the left of the shot. (02:09:36)
Other mistake: When Toomey looks out the airport window toward the plane, there is an airstair unit rolled up almost against the aft right side of the airplane in front of the horizontal stabilizer. The airplane didn't taxi (not could it) to swing past the airstair unit. The wing wouldn't have cleared it. (01:06:25)
Other mistake: Aircraft door is closing, aircraft is going underway. The roll up stairs are still on the side of the aircraft, I used to fly the L-1011 for a living, the side air stairs would cause a bit of damage to the leading edge of the wing. Next scene shows aircraft underway and no air stairs and no the target style engine reversers weren't used in this situation (these aren't clam-shell style as the other writer has probably seen on the arc-9/MD80 series aircraft), there would be a lot more noise and turbulence. (02:15:00)
Continuity mistake: When the Langoliers begin eating Toomey, Nick grabs hold of Laurel while he closes the door. In one shot, Laurel's hair is under Nick's arm leaving her left shoulder exposed. But in the next shot as the door starts to close, Laurel's left shoulder is suddenly covered by her hair. (02:14:54)
Continuity mistake: When Nick sits back in the passenger seat after Brian turns away from the time rift, he is holding onto his left arm after banging it. When he sits down, his left hand is placed over his right arm. When the shot cuts, his left hand is suddenly raised upward slightly. (02:34:58)
Continuity mistake: When Brian is about to fly back through the time rift, there is a mixture of blue and orange lighting coming from the rift that is cast on him and the wall behind him. When Nick rushes into the cockpit to tell him to turn back, in the close-up of Brian, the wall behind has blue light on it. When the shot cuts to have Nick and Brian in the frame, the wall now has orange light on it. (02:33:43)