Cunningham served as producer and Craven served as writer and director on the project. Written by Craven in 1971, the original script was intended to be a graphic ''hardcore'' film, with all actors and crew being committed to filming it as such. However, after shooting began, the decision was made to edit the script into a much softer film. This script, written under the title Night of Vengeance, has never been released; only a brief glimpse is visible in the featurette Celluloid Crime of the Century (a 2003 documentary on the making of the film). The crux of the plot is based on the Swedish ballad ''Tores dottrar i Wange,'' which itself was the basis of Ingmar Bergman's The Virgin Spring (1960), of which Craven was an admirer. Craven envisioned a film in which the violence would be shown in detail onscreen; he felt that many popular films of the era, such as Westerns, glamorized violence and the ''vigilante hero,'' and gave the public a misleading representation of death in the wake of Vietnam War.

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is last house on the left true story

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