A psychological portrait of James Dean, Hollywood's iconic 1950s rebel, focuses on the year 1955, when he died in a car crash at age 24. “This boy; that year,” sighs Lois Smith, Dean's costar in “East of Eden,” one of three movies he made or were released in 1955 (the others were “Rebel Without a Cause” and “Giant”). Smith and other Dean colleagues review the films and Dean's “psychological involvements” (as actor Bill Bast puts it) in them. Says Martin Landau: “He understood pain.”