Revealing mistake: When Victor springs back to life, his tongue is visible, even though the doctor says he chewed it off. This is seen just after Somerset says, "Emergency on that ambulance!"
Continuity mistake: In the final scene where they are in the desert, the sun hits John Doe first on the left and then on the right side of his face in two different takes.
Revealing mistake: When Somerset looks inside the box towards the end of the movie and then turns through Mills and Doe in the distance, if you watch carefully, you can see that Spacey and Pitt are actually replaced by two stand ins. (01:56:57)
Continuity mistake: When the three protagonists are in the desert towards the end of the movie, as Mills angrily points the gun at John Doe's head, saying to him "You liar, you f***ing liar", some clouds can be seen behind him, but when the angle changes the clouds have vanished.
Continuity mistake: When Somerset, Mills, and John Doe walk away from the car near the end of the film the doors on the passenger side of the car are left open but when Somerset runs to back to the car to meet up with the delivery van the doors are suddenly closed without anyone closing them.
Chosen answer: A woman shot her husband. The other detective on the scene says to Somerset, "he's dead, his wife killed him."
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