Filming took place during the coldest winter in Utah in 83 years. The temperature dropped about thirty degrees during the night, when much of the action takes place.
The interiors of the mansion were built in the gymnasium of a local high school. The attic set was constructed on the stage of the school's theater.
The mansion was actually a three-wall set, constructed in a remote area in the Utah hills.
All the statues and paintings seen in the opening credits were specifically created for the movie.
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