This episode marks the first appearance of a Vulcan starship.
	When Lt. Reed and Ensign Mayweather set off the explosives on the comet, there is an audible explosion. This is impossible because the explosion occurs in the vacuum of space, where there is no sound.
	It is revealed that since setting off in "Broken Bow", Enterprise has been followed by Vulcan ships. If that is true, why didn't they help when Enterprise was under attack in "Fight or Flight" or help repel the Andorians who were looking for the sensor array in "The Andorian Incident"?

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