Other mistake: If the bullets from the super gun move at just under the speed of light, how come the bad guys can't hit him or the girl? The bullets would arrive almost instantaneously and that would mean minimal compensation for them running. Plus the guy had them locked on when he shot.
Eraser (1996)
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Directed by: Chuck Russell
Starring: Arnold Schwarzenegger, James Caan, James Cromwell, James Coburn, Vanessa Williams, Robert Pastorelli
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More mistakes in Eraser
Morehart: This is James Haggarty, our chief of security.
Robert: Hey, you ever done any wetwork?
James Haggerty: Only on three different continents.
Robert: Wow, really? Listen, you wanna impress me, slick? Do your fucking job.
Trivia: A projectile hitting the air at near the speed of light" (about 334,800,000 MPH) would instantly vaporise in a huge, blinding flash from the ridiculously intense frictional heating that would occur at such an enormous velocity in the atmosphere. The energy released would probably kill the shooter and anyone standing anywhere near him. Makes for a good movie effect though.