Director Ed Zwick revealed details of his tense relationship with Brad Pitt while filming Legends of the Fall in his memoir, Hits, Flops, and Other Illusions: My Fortysomething Years in Hollywood. Zwick claimed he even got a call from Pitt’s agent saying “Brad wanted to quit” after the first table read of what would become an award-winning ’90s flick. “It fell to [producer] Marshall [Herskovitz] to talk Brad off the ledge,” the director penned in an excerpt of the book. “It was the first augury of the deeper springs of emotion roiling inside Brad.” “He seems easygoing at first, but he can be v…