The still above is not from David Fincher’s “Zodiac” but from Norman Foster’s “Charlie Chan at Treasure Island” (1939), the best of four Charlie Chan films starring Sidney Toler out today that I discuss in The Post. They comprise Fox’s fourth Chan set, which includes such fascinating featurettes as a talk with 94-year-old Chan Kay Linaker, a veteran of four Chan mysteries, as well as a look at the world’s fair at San Franciso’s Treasure Island, which ran concurrently with the more famous one in New York in 1939-40. I also review Warners’ second Joan Crawford set, which has five titles and excellent featurettes on Crawford’s teaming with Clark Gable and her years at Warner Bros., not to mention “Torch Song,” which was originally intended by MGM as a modest vehicle for Cyd Charisse but ended up as a Crawford camp classic, and George Cukor’s proto-noir “A Woman’s Face” (1941), which MGM unsuccessfully sought Alfred Hitchcock to direct.