Sally Field’s “In Pieces” is not a typical Hollywood memoir. The most powerful and revealing parts aren’t about Hollywood at all, but about the cruel, infuriating injustices foisted upon her during childhood at the hands of her stepfather, the stuntman and actor Jock Mahoney, who lived and breathed just enough Hollywood to keep his family marginally afloat and his ego in constant tatters. His stepchildren, Field and her brother, Rick, were an easy outlet for his frustrations.