Corrected entry: When they get on the subway train and are retina-scanned, one of the passengers is seemingly scanned through her eyelids, or at least the flash of light appears only on her lids. This should not be possible with how retina scans identify very fine details. (00:45:05)
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Correction: This is taking place 50 years from now, it is not inconceivable that scientists would have figured out such a new technology. While some scanners in the movie seem to need full access to the eye, there's nothing to say that the larger static scanners in public places can't work more efficiently.
Sereenie