Factual error: When Smithers (not identified by name in the movie) gives Alex his kit, it includes a fountain pen which shoots a dart filled with Sodium Pentathal. That's supposed to cause a person to do what Alex says. Sodium Pentathal is a form of barbiturate. Barbiturates cause impaired coordination, therefore it's unlikely that Mr. Grin could have flown a helicopter under its effects.
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