24 Fun Facts You Never Knew About "Ghostbusters"

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5. Dan Aykroyd’s script originally took place in the future, but Harold Ramis rewrote it to take place in modern times.

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As a result, the production budget was cut from a projected $300 million (according to director Ivan Reitman) to just over $30 million.

10. Ray Parker Jr.’s theme song for the film was a No. 1 hit for three weeks.

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Huey Lewis later sued Ray Parker Jr. for plagiarism, due to similarities between the Ghostbusters theme song and Lewis' "I Want a New Drug."

14. Ghostbusters was the highest-grossing comedy of all time, until the release of Home Alone.

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It made $240 million domestically in 1984, which is equal to about $580 million when adjusted for inflation.

15. The term "proton pack" was never actually used until the middle of Ghostbusters II.

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In the sequel, Spengler said "before we go any further I think we should get our proton packs."

16. The guns for the proton packs were originally wands.

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The wands were changed to laser guns to make it more believable that the Ghostbusters created their gear from practical equipment.

21. To show its massive size, the Stay-Puft Marshmallow Man was originally supposed to come out of the water next to The Statue of Liberty.

22. There was a second version of the Librarian Puppet, but it was rejected because it "looked too disgusting."

Columbia Pictures / Via slantmagazine.com

It was later used in Fright Night, which was released one year after Ghostbusters.

All facts come from IMDB.