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Four Flies on Grey Velvet (1971) Poster

Trivia

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A slow-motion bullet effect is used in the film, pre-dating The Matrix and many Hong Kong action films.
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Deep Purple was originally considered for the soundtrack.
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Argento's usual collaborator Ennio Morricone scored the film but had a major argument with Argento over some tracks Argento didn't want in the film. As a result, the director and Morricone would never work together again until 1996, and the rock group Goblin would eventually become Argento's regular composers.
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In the United States, the soundtrack by Ennio Morricone is available on CD. The movie itself was unavailable until early 2009.
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The Italian poster for Argento's earlier film The Bird With the Crystal Plumage can be seen in a street shot as Roberto drives through the city.
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Argento didn't want to use the "image caught in the retina" plot device since it was too fantastic for the giallo genre. But once Carlo Rimbaldi showed him how the effect would look like in the finished film, he soon changed his mind.
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This was originally intended to be Argento's swan song to the giallo genre. This would later change once Five Days of Milan did poorly at the box-office.
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Some of the earlier cast considerations for the main role of Roberto Tobias were Terence Stamp, Michael York, Tom Courtenay, James Taylor and Ringo Starr.
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It was Jean-Pierre Marielle's own idea to make his character gay.
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Spoilers 

The trivia items below may give away important plot points.

This is the only movie of Argento's classic giallos in which he doesn't show us the assassin in the first sequence.
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Mimsy Farmer's death involving a slow motion car crash in the end took 12 different cars to be wrecked in order to get the effect Argento wanted.
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See also

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

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