Michael Schneider Variety Editor at Large The producers behind CBS’s new “Young Sheldon” spinoff “Georgie and Mandy’s First Marriage” knew the show needed to immediately address the comedy elephant in the room: Unlike “Sheldon,” which was a single-camera half-hour, “Georgie and Mandy” is a multi-cam laffer shot in front of a live studio audience. That, of course, is also how “The Big Bang Theory” — the hit that spawned “Young Sheldon” — was taped.