The power of Nat Segaloff’s research should compel fans to pick up a copy of the behind-the-scenes book.

What an excellent day for some light reading about horror.

Here are five head-spinning revelations from the tome.

Linda Blair in ‘The Exorcist’

Linda Blair in ‘The Exorcist’.Everett Collection

Where do these things begin?

InThe Exorcist Legacy, Burstyn recounts having dinner withThe Apartmentstar and all-around Hollywood legend and talking about the movie.

“But I don’t think that Bill Blatty ever meant to cast her.

The Exorcist Legacy

Cover of ‘The Exorcist Legacy’.Citadel Press

The film does have its fans includingMartin Scorsese.

“ButThe Hereticsurpasses it.

Maybe Boorman failed to execute the material, but the movie still deserved better than it got.”

“And I said no.

And they surprised me and doubled the offer.”

The Exorcist Legacy: 50 Years of Fearis available July 25.

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