The original ending to the film featured a young couple being shown around the apartment after Mary has moved. The final shot focused on the telephone ringing ominously. The ending that was eventually used was actually to be the second-to-last scene in the film.
The story originally existed as a 25 minute one off television program for BBC Scotland. The cast had consisted of two actors only, and only one of them was ever on screen.
Several of the conversations recorded for the film weren't rehearsed to make each call surprising for Rachelle Lefevre.
Rachelle Lefevre politely avoided ever meeting/spending time with Lorna Raver (the voice of Rose) on set so that she could keep the mystery of Rose in her mind and keep her reactions genuine.
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