
Continuity mistake: Near the end of the film, on the train ride out of the Hive, Rain is quite close to becoming undead. When she speaks, we notice her teeth are still "movie-star white". However, a few shots later, when she becomes a zombie, she sort of hisses where you can see it has taken what couldn't have been more than a few mere minutes for her teeth to become brown and discolored. (01:21:00)
Answer: Actually the T-Virus was originally meant as a cure for a genetic disorder that Dr. Ashford and James Marcus daughters suffered from. The reanimation was a side effect and James Marcus was killed by Dr. Alexander Isaacs so he could take control of it and turn it into a bio-weapon.
lionhead