When Boa Vista is analyzing the DNA from the blood on overhead compartment lid, the shot of her face shows the monitor to be Dell, however when the camera shows the results of the DNA test, the monitor is shown to be an Apple Mac.
(at around 48 mins) When Natalie and Ryan examine the plane and find the hatch leading to the "private refuge", the underside of the hatch is gray. When they go up into the room, the bottom of the hatch is white.
The hidden elevator that is also a closet has a pole that runs across it. This would stop the floor from moving up unless the pole moved up as well, which it does not.
There is no ladder set up in the cargo hold so that the stewardess could easily climb down after dropping the victim.