- Shot in 30 days.
- According to director David Moreau star Olivia Bonamy suffered from claustrophobia and much of her performance as she crawled through the narrow tunnels was the result of her genuine fear of the tight spaces.
- The house used in the film was an actual sprawling old estate in Bucharest, Romania. The house was so large that the production was unable to furnish all the rooms for shooting, but it was also large enough that the entire production worked out of the location.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: The "true story" in which the film was based upon involved an Austrian couple that was murdered by three teenagers in their vacation home in Romania.
- SPOILER: As a promotional gimmick the official website for the film ran a mock news interview where a woman whose suppose to be Clementine's sister pleaded for the safe return of her missing sister and Lucas.
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