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.
Trivia: Just something to look for: in the scene when Gwenyth Paltrow goes to see Mike Myers about how she thinks her test scores were messed up, she asks him if she can retest and he says, "That's not procedure." The shot then goes back to her and you can see a plaque on the wall that says "That's Procedure."
Trivia: When Gwyneth Paltrow is meeting with Mike Myers to discuss her disappointment over being assigned to Royalty's commuter line, look at the photographs on the counter that the camera lingers on. Myers, whose character had a crossed eye, is seen in photographs with Sammy Davis, Jr., Marty Feldman, and Peter Falk, each of whom had well-known vision impairments (Davis and Falk each had a prosthetic eye, and Felman had a condition that caused his eyes to bulge).