Few things on television could seem more pleasingly old-fashioned and simply entertaining than NBC’s “Hollywood Game Night,” which returns for a third, schedule-padding season on Tuesday night. The show gathers six different celebrities whose fame varies from the C+ list (Turtle from “Entourage”; what’s-his-name from “Grimm”; Penny from “The Big Bang Theory”) to the occasional B+/A- (Amy Poehler, John Legend) for a hip, loungey exercise in the time-honored tradition of watching our stars play a variety of clever party games that draw on our culture’s last remaining expertise: showbiz trivia.