Other mistake: In the scene where they are 1st landing at Bangor it is known that there is no electricity at the airport. If you look closely during the landing you will see that the runway lights are on. (00:50:40)
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.
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.
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)