Revealing mistake: After Christine gets out of the shower, we hear the director cue her by saying, "Go," before she walks past the camera.
End of Days (1999)
1 revealing mistake
Directed by: Peter Hyams
Starring: Arnold Schwarzenegger, Gabriel Byrne, Kevin Pollak, Robin Tunney, Miriam Margolyes
Continuity mistake: After the priest writes down 666 on a piece of paper, he holds it upside down to reveal that it is 999. When we cut back to him a few seconds later, the numbers look completely different. (01:05:40)
Cardinal: We're not afraid to die for our cause.
Jericho Cane: Good, because I'm not afraid to kill you.
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Answer: The Vatican is aware of the birth, somewhere in the world, of Christine (though not knowing her identity at the time), and the Satanists are present at her birth and know that she is "the one." It's safe to assume that the Vatican, and the Catholic Church in general, has spies/informants in the Satanists' society, and were able, in the intervening 20 years between Christine's birth and the events of the film, to track her down to New York and send Aquinas there (the fact that he was sent by the Vatican is established).