In general, commercials tend to only be broadcast for one or maybe two years, while television, movies, and specials have been rebroadcast and released on video many times (not counting TV Land's Retromercials or the fact that we can watch almost any existing commercial online these days).
The various inserts on Sesame Street have been made to be like commercials, appearing in multiple episodes as a result. But it seems like these "commercials" are the other way around, with the street stories only shown during their initial seasons (and maybe repeated two years later) while the many inserts have been repeated for years, with many (especially earlier ones) airing in new episodes for over three decades. Of course many full episodes were not rerun on cable until 1999, and full episodes/street stories were rare on home video until the 2000s. And many street stories and even full episodes from the past two decades have been more commonly officially available and rerun for more years.