Episode Trivia


Spock throws the soup out of his quarters, then Kirk has a conversation of several minutes with him. When Kirk leaves, the soup is still on the wall, which doesn't speak well for the crew's clean-up efficiency.
This episode introduces the concept of Pon Farr.
First use of the Vulcan "Live long and prosper" salute.
First look at the planet Vulcan.
In this episode, Kirk can barely get Spock to talk about the Pon Farr. It is said to be "a very personal thing to the Vulcan people." However, in "The Cloud Minders" in the third season, Spock talks about it casually to a local. In Star Trek III when the young Spock enters Pon Farr, Saavik nonchalantly tells David about Pon Farr without so much as batting an eye. In the ensuing years between the episode and the movie, has the Pon Farr now become common knowledge? Worse, in Star Trek: Enterprise, which precedes this episode by almost a century, they talk about Pon Farr freely as well. This is basically the only episode where they don't talk about it freely.
T'Pau would later reappear in the "Star Trek: Enterprise" episodes "The Forge", "Awakening" and "Kir'Shara".
Plomeek soup would later be a favoured dish of T'Pol. Chef Riker would prepare it for her as part of the Enterprise crew's final meal in "These Are the Voyages...".
In the mid-episode with Christine in Spock's cabin, he wipes away a tear on her cheek and her face is clear. In the next shot a second later, what seems to be the same tear is back on her face again.