Rechov Sumsum Theme Song Goof

[Careforwilkins]

If you listen closely to the classic Rechov Sumsum theme song, specifically right before the song starts, you can hear someone signaling the band to start playing ("one, two, three"). I don't know how this went unnoticed. https://www.retrojunk.com/content/c...esame-street/7#/content/child/intro/5689/show [Starts at 0:22]
I checked the theme song in multiple episodes to make sure, and it was there every time. It's kinda baffling to me how a mistake like that went unnoticed throughout the entire series run.