Marci Klein sure doesn’t have to look very far to find the talent for NBC’s “30 Rock,” for which she is executive producer. On Thursday night’s episode, her father Calvin Klein made a brief but humorous cameo as himself. After Jon Hamm, who is strolling down an avenue with Tina Fey, gets complimented for his looks by a stranger and has his parking ticket torn up by a traffic warden, Klein taps him on the shoulder and asks, “I am Calvin Klein and I think you should be my next underwear model.” Of course, it’s fiction: Calvin Klein no longer casts the brand’s models.