This past week, Alex fell deep into a Guillermo del Toro hole while Liv suffered from Wakanda turrets. They review “Pan’s Labyrinth,” David Letterman’s new Netflix series “My Next Guest Needs No Introduction,” “Godless,” and a weirdly optimistic episode of “Black Mirror.” Plus, hear Margot Robbie’s husband’s mortifying account with President Barack Obama, and find out if Taylor Lautner is actually 1/64th Cherokee.