“[H]er name came up early in the episode, set in 1963, as the show’s ad executives were meeting with developers to discuss plans to knock down Penn Station to make way for the new Madison Square Garden. … After one of the agency execs reads from a Huxtable piece condemning the plans, one of the developers gives him a sour look. ‘Ada Louise Huxtable is as green as that folder,’ he retorts….”