Revealing mistake: In the scene where Donna flies as a captain, you can see on the throttle quadrant there are three levers for three engines. There are groups of four dials instead of three for engine temperatures and pressure, and they don't even show symmetric values for similar engines. Furthermore, the altimeter reads over 3000ft, equivalent to a landing in Switzerland or Peru. Finally, there are multiple red and yellow lights on the panel; these colors only come on as a warning like low cabin pressure or engine fire.
Continuity mistake: At the Christmas party, Ted kisses Donna. He places his hands on her shoulders. Then the camera angle changes, and his hands are on his lap - it happened too quickly for him to have moved them. (00:47:50)
Factual error: In the end of the film, just before Donna is shown inside a cockpit as an airline pilot, there's a shot of her aircraft landing. She flies for Royalty Airlines, but you can see the blue, white, and red stripes of an American Airlines plane.
Factual error: When Donna first gets to work First class, it is obvious that the plane she is in is a wide body airplane. However, when the plane is seen taking off, it is a narrow body Airbus.
Other mistake: The same cockpit interior mock-up used for the propeller plane (Sierra) near the beginning of the movie is seen again as the Airbus jet at the very end.
Continuity mistake: When Donna is at Sally Westin's house discussing her test results, Sally has Donna's test papers in her hands. In the next shot, Donna's test papers are on Sally's desk. Sally gets up from her desk chair and walks around the desk to speak with Donna. When Sally walks back to sit down at her desk chair, Donna's test papers are no longer on the desk and have totally disappeared.CARAMENTE22