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...
Klingons look very different through the various shows. And more than just costuming progress of the time.
TOS:
TNG-era, the one I think most people would think of:
Discovery:
And the latest show, Academy, reverts back to TNG-era style Klingons.
Is the cannon explanation for tos to tng change being a skin disease or something that has infected the whole population?
Enterprise established it as a result of Klingons experimenting with human augment DNA and it getting out of hand. It probably didn’t need to be addressed in universe, but I thought it was a fun retcon.