The bio-metric locks in any high-security building will sound the alarm if presented with a human hand (or eye) that is not alive.
When Lin gets pulled over for speeding, the policeman says she was going 120 miles per hour. Just before being pulled over, her speedometer was indeed pointing in the 100-120 area. But the only units on the speedometer are "km/h", so she was only going 65-75 mph.
It is unclear how primitive warriors from 9th-century Britain could travel to Siberia and Polynesia to bury the evil things.