“Poker Face” sits at the center of a motley Venn Diagram. It is simultaneously a nostalgia-drenched mystery-of-the-week series in the tradition of detective shows of the ’70s and 80s, a road trip show with a constantly rotating cast of characters, a star vehicle for Natasha Lyonne who plays human lie detector Charlie Cale, and a distinctly modern black comedy that blends murder, class mores, and touches of the absurd. Lyonne’s “Poker Face” character, human lie-detector Charlie Cale, is equally eclectic.