Tina Fey’s “30 Rock” had guest stars including Jon Hamm, Jennifer Aniston, Matt Damon and Oprah Winfrey during its seven-year run, but Fey says the one that got away was subway-ad icon dermatologist Dr. Jonathan Zizmor. She said Wednesday at a Paley Center for Media panel, “He turned us down! His wife was like, ‘He’s a doctor.’ ” Fey also gave tips to aspiring writers: “The advice I reserve for women in comedy is always wear a bra, even if you don’t feel like you need one that day.”