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People Say:

The "Attaboy Guy's" voice sounds a lot like Jack Weston (George Stickel from "The Incredible Mr. Limpet")
Jack Weston
Jack Weston was later cast in two Steve McQueen pictures The Cincinnati Kid & Thomas Crown Affair..Memorable in Wait Until Dark
Jack Weston
Patrick Swayze, Jennifer Grey, Jerry Orbach, Cynthia Rhodes, Kelly Bishop, Jane Brucker, Jack Weston, Max Cantor, Lonny Price