In the 39th minute the pilot announces that they are are 2,000 feet. Three seconds later he repeats this.
When Hector goes down to free the nose gear, when the gear retracts it retracts to the rear, yet when the aircraft comes in to land in Germany after going through the vortex again, the nose gear lowers from the front.
At the beginning of the movie, the captain is talking with Gander Centre, which is in Canada. Minutes later, the plane is flying through a bombing raid in France. There is no indication of how or when the plane managed to overfly its destination without ever contacting a British controller.
Cannons from the German Me 262 should have shredded the commercial airline in a few hits. Here the aircraft takes it all as if it was a tank. Took two hits from surface to air and air to air missiles and yet it survived.
The German Me 262 jet used an MK 108 cannon that fired 30×90RB mm projectiles, sometimes explosive. When co-pilot is shot, his wound is typical of a gunshot wound. In reality, a person shot by such a high caliber shell would likely be nearly torn in half and die instantly.
Early part of the movie, when they realize no other traffic is showing on radar, the Captain decides to "make a loop" to see if anything shows up. First off, a "loop" in an aircraft is a 360 degree move in the vertical plane, something never done with a commercial aircraft... he meant a turn. Second they started the maneuver by pushing forward on the control yokes which would begin a descent. In a turn, you normally descend unless you ease back on the yoke to maintain lift.
Civilian airliners do not have radar units on board that scan for other airborne traffic. They have a weather radar in the nose that can scan across roughly 60° for precipitation. There is a unit called TCAS (Traffic Alert and Collision Avoidance System) that can detect nearby aircraft, but it is not a scanning radar unit, and depends on the other aircraft having a radar transponder on board.
When Captain Strong appears in the cabin at minute 49 to explain the situation to the passengers we only see about 20 passengers (in fact we only ever that one single group of passengers throughout the film, some pertinent to the plot others not). A commercial Boeing 757, of any derivative, carries a minimum of 170 passengers. It is ridiculous to think that a commercial jet would carry under 20 passengers all huddled together in one single cabin.
At the end of the movie, the plane is purportedly landing in Berlin. However, the airport in the establishing shots is clearly in Canada (possibly Vancouver), given the presence of a WestJet 737 and a Pacific Coastal Saab turboprop, as well as the Canadian flag flying from the terminal building.
In the 74th minutes the pilot has a ridiculous UK accent typical of US actors trying to pull off a UK accent.
On landing, the plane appears to flop down on its main and nose landing gears almost simultaneously. Even in an emergency landing, there would be several seconds between then main and nose gears contacting the ground. A landing as shown would likely have caused severe damage to the airframe.
Miscellaneous stupidity: The cover art for both versions of the movie show a Boeing 747, which never appears in the movie. The original title, "Flight 1942" implies the movie takes place two years later than it actually does. Finally, the "Flight World War II" cover art implies that US infantry soldiers (at least, of the 2nd World War period) play a role in the movie, which they do not.
The flight passes through the bombing of St. Nazaire, which is on the west coast of France. Minutes later, they are about to cross into Germany, and Cpl. Nigel tells them they should consider changing course. Covering that distance should take at least an hour.
The aircraft is said to be close to the French border with Switzerland when the decision is made to airdrop the radar. Minutes later, Corporal Nigel is using it at his base. After Dunkirk, there were no British Army troops on the continent until 1944 (particularly if, in this alternate history Dunkirk was a rout). It ought to have taken days to get the radar back to Britain.
At the end of the movie, the plane emerges from the vortex, back in the present, and is immediately in contact with air traffic control requesting an emergency landing in Berlin. However, when the plane 'disappeared', the crew was still in contact with Gander Centre in Canada and had a flight plan to London Heathrow. The German controller seems completely unfazed to have an airliner appear out of nowhere hundreds of miles from its intended destination.
The plane "arrives" in the middle of an attack on St. Nazaire (west coast of France), and proceeds on an easterly heading into Germany. No explanation is given as to why the captain doesn't change course immediately and head towards Britain. Even with only a magnetic compass and a rudimentary knowledge of geography, it wouldn't be all that hard to find.
Young Nigel Sheffield, as a British radio operator in 1940, would never pronounce the word "charade" as "charaid". The Americanism of the word is pronounced as "charaid" however in Britian, then as now, the word charade was pronounced as "cha-rard"
The "International Airlines" female Flight Attendants during flight are still wearing their uniform hats, during flight airline flight attendants don't keep their hats on they only wear them when boarding and disembarking.