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He Knows You're Alone (1980) Poster

Trivia

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First movie appearance of Tom Hanks.
In the DVD commentary, director Armand Mastroianni said that horror fans frequently confuse this film with When A Stranger Calls (1979), because of their similarly threatening titles. Mastroianni also said coincidentally, 'He Knows You're Alone' and 'When A Stranger Calls' were both playing at a New York City theater at the same time. He said that the theater marquee read 'When A Stranger Calls He Knows You're Alone' as if it was all one big movie title.
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The shooting of the film was done in fifteen days, and the entire production process, from writing to final cut of the film, was done in four months.
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According to writer Scott Parker, Tom Rolfing was cast as the killer, because Armand Mastroianni liked the intense look of Rolfing's eyes.
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Producers George Manasse and Robert Di Milia cameo as the angry drivers that shout at Detective Gamble during the chase scene.
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According to Armand Mastroianni and Scott Parker, the film had numerous working titles throughout the production. Among them were Blood Wedding, Shriek, and The Uninvited. It was the studio that finally attached 'He Knows You're Alone' to the film, after it tested well with audiences.
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For years it was believed that Pat Benatar's hit song "Hell Is For Children" was featured in the film's soundtrack. The song, however, is never heard throughout the film, nor credited on the closing titles.
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Tom Hanks later described the preposterousness of the carnival scenes on Late Night with David Letterman (1982), noting how ridiculous it was to depict the rides being 'enjoyed' by patrons in freezing temperatures.
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Spoilers 

The trivia items below may give away important plot points.

In the original script, Elliot (Tom Hanks' character) was supposed to fall victim to the killer. However, Hanks was so charismatic on screen that the writers opted to not film Elliot's murder.
Body Count: 8 (with an implied ninth).
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See also

Goofs | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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