The cast were not informed of the identity of the killer until the last day of principal photography. Also, the cast did not receive the last ten pages of the shooting script until it was time to film the scenes contained therein. Furthermore, the last ten pages of the shooting script were printed on gray paper in order to deter illicit duplication of them. All cast members were required to sign confidentiality clauses as parts of their respective contracts that precluded them from discussing the outcome of the story and the killer's identity.

Film

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