The Ad
Actually, as I read the posts, it's getting more clear in my mind...Carol had a cousin named Myrna or something, who was an actress and she was coaching them. She tells Mike that he should be thinking about how white his shirts look when he's at the office, and Carol should be thinking, "wow, he brought me a box of that stuff!" When the director was disappointed, they said they were simply being motivated. The director called it off and commented to a cameraman or something, "this reminds of that bad actress, Myrna!"