Saturday's TV highlights and weekend talk shows: 'Dirk Gently' s Holistic Detective Agency' on BBC America

We Bought the Vineyard A California couple want to buy a vineyard home in Paso Robles in this new unscripted series. 2 p.m. HGTV

Saturday Night Live Kevin Hart hosts with musical guest Foo Fighters. 8:29 and 11:29 p.m. NBC

Ten Days in the Valley As this drama resumes with two new episodes,...