The stars of Mad Men got together to discuss their hit show at The Paley Center for Media in NYC last night. Jon Hamm, January Jones, Vincent Kartheiser, and the rest of the cast sat down with show creator Matthew Weiner and moderator Brian Williams for a candid discussion about the new season. During the beginning of the panel, Brian joked with Matthew about an inaccuracy from Sunday's episode — don't forget to check out our Mad Men recap — where Joan, played by Christina Hendricks, said that she had made a reservation at Le Cirque, a real-life NYC restaurant that didn't exist in 1968, when the episode took place. Matthew laughed, "Christina Hendricks isn't here, but she ad-libbed that part." Brian also asked about another un-'60s moment when Don ordered an "Old Spanish," a made-up drink from 30 Rock, which Jon, Brian, and John Slattery have all guest-starred on. Matthew and Jon confirmed that the drink order was purely a nod to Tina Fey's former show. The event was the second big night out for the group this week after they attended a BAFTA celebration of Mad Men in the Big Apple on Monday. Stay tuned for our interview with the cast from the Paley Center panel!