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The New Mexico trip, which aired in both 1975 and 1978.
On Sesame Street, in order to produce 130 shows a season, sometimes the street scenes from an episode that aired two seasons before were recycled and combined with a different set of inserts to create a new episode. This list contains all known episodes that contain the same street plots. This practice started as early as Season 6 and lasted until Season 32, since the episode total diminished in later seasons. The practice has been re-instated as of Season 41.
Due to the introduction of Elmo's World, no episodes in Season 30 and Season 31 had any recycled plots from Season 28 and Season 29.