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After Matthew successfully fixes the water pipes in Jennifer's bathroom at the beginning of the film, Jennifer embraces him with a hug and kiss, saying, "You saved me from having to bathe in the lake!" Soon after her brutal assault by Matthew and his friends, bathing in the lake is exactly what she ends up doing.
According to Jeff Branson, although it was never used, there was an "out word" that Sarah Butler was to use if the rape scenes got too intense for her.
In the final shooting script, Jennifer was intended to arrive at the cabin with her dog and it was to be featured heavily during the introduction of the film. The dog was written out of the script last minute because hiring a trained dog for the intended shooting schedule would put the movie over budget. According to the director Steven R. Monroe, "The dog would have made more money than anybody on the movie."
At the beginning of the film, Jennifer buys $19.78 worth of gas. 1978 is the year the original film I Spit on Your Grave (1978) was released.
After casting was completed, the actors had only two weeks to prepare and rehearse for the shoot.