The second assistant director kept the set running on seasons two and three.
The episode is widely disliked, so you probably haven’t seen it in a while. I encourage you to watch it again. It’s not hippies and bouncy songs. It’s a mass murderer and his enthralled gang.
Walter Koenig, I need you. Please come back to Toronto. Also, did you know Canadians got to see Star Trek before the Americans?
George Takei was thrilled when John Wayne cast him in The Green Berets, but that robbed Takei of the chance to pick up a Tribble with Uhura on K-7.
Except that story is not quite true.