Answer (1 of 14): The term “continuity error” gets thrown around a lot in reference to Trek, oftentimes erroneously.
Some of the most famous “continuity errors” can be explained with a little imagination and common sense.
WHY DOES KHAN KNOW CHEKHOV IF CHEKHOV WASN’T INTRODUCED TO STAR TREK UNTI...
That’s also how it works in the recent game where you replay Voyager’s journey. You just have your engineers research photon torpedo building, and then doing so uses up a portion of your normal tech resources.