Director Clint Eastwood saw three versions of the Tony Award winning musical before casting the film adaptation of “Jersey Boys,” which charts the rise of 1960s pop-vocal group The Four Seasons from the mean streets of New Jersey to the top of the charts. Eastwood knew that finding the right actors was the key to transforming the hit juke-box musical, among the longest running shows on Broadway, into the film that opens in U.S. theaters on Friday. Eastwood said, “Casting for me is one of the most important things next to the writing.”