You have questions. I have some answers. Q: My family and I have been enjoying the old “Big Bang Theory “series. At the end of each episode there is a “writing” about someone’s day or something someone is writing about. What is that? A: You have been noticing the so-called “vanity cards” displaying logos of production companies at the end of shows. While some became famous for their images (the MTM cat, for example), writer-producer Chuck Lorre has used them for observations, thank-you’s, social commentary, tidbits about making his shows and other items. One sample, from a 2014 “Big Bang” card…