Revealing mistake: When Sil fakes her death, the breaker box explodes before the car hits it.
Revealing mistake: When the team is at the motel and seeing the tape of Sil on it, when the motel clerk tells them where she went, Michael Madsen can be seen smirking, obviously breaking character.
Suggested correction: They never said Sil was a natural predator when they created her. She was half human and half alien and it was their belief that human females are more docile (i.e. more motherly, more gentle, more empathetic, and less aggressive than human males). Although the reply to "more docile and controllable" was "you guys don't get out much", meaning that girls aren't that docile and controllable.
Bishop73