@Bob - Regardless of it being a slip-of-the-tongue or not, it was kept for the final edit. This highlights again how two people, when presented with the same episode can have two different interpretations
Sustained. Just another example to demonstrate the difference between the Thermian's and Brandon's approach. The Thermians take the dialogue literal, Brandon would also consider the possibility of a production glitch.
Same story with the star map from "Balance of Terror": Thermians take it literal, Brandon might find its research value limited to what it was - a VFX made up just to give us the basic idea (left it's us and our outposts, separated by a neutral zone from our antagonists).