Just some Goofs.
when the plane is landing at the start the stewardess announces 'the plane will be landing momentarily' meaning it touches for the briefest time and takes off again, I think they meant 'imminently' or 'in a moment'.
When the stewardess is strangled in the toilet cubicle, the cleaner is shocked when she finds the 'dead body', as she would be, except we immediately see the stewardess is not dead, she's hugging the toilet as if she drank too much, would that cause shock to a regular toilet cleaner? I don't think so!