Character mistake: A character mentions carbon-dating one of the fossils found. This is preposterous... you can't carbon-date fossils like the ones being shown. Radiometric dating maybe... But certainly not carbon dating. He's a professional and should know more than better that carbon dating wouldn't work.
Guyver: Dark Hero (1994)
1 character mistake
Directed by: Steve Wang
Starring: Bruno Patrick, Christopher Michael, David Hayter, Kathy Christopherson
Revealing mistake: At the end of the final battle, when Sean rips the Guyver unit out of Crane's head and delivers his one-liner ("this model... has been recalled!"), you can see Sean's previously rigid, metal-like mask bending like rubber as his right shoulder rubs against it in the close-up. Particularly noticeable is the vent where steam sometimes shoots out, which bends nearly 45 degrees for about a half-second. (Revealing it's likely some sort of latex "stunt mask" for the actor to wear during fight scenes.)
Sean Barker: The Guyver Unit. It's been a year since the alien armor invaded my body and became a part of me. A year since I first became the Guyver and destroyed the Chronos Corporation and their shape changing killers, the Zoanoids. Now Chronos is gone. But the Guyver stays in me. Calling me to fight. To kill.
More trivia for Guyver: Dark Hero