Failure to do basic math
In the scene after Sara and Eve landed in New York, Sara says she's been thinking "about this mystery guy I met a million and a half hours ago".
1.5 million hours = 171.2 years.
She should stop thinking about him by then, cause in all likelihood that guy is dead and buried. Why can't Hollywood writers and actors do basic math? Judie Foster in "Contact", Kate Beckinsale in "Serendipity"...
Seriously, don't just check the spelling, check the math!