Too many things to list? (Exhaust coming out of where the Shuttlecraft bay doors are located was a common error in early artwork of the Enterprise.) IIRC, the Gold Key comics were often done by people who had never actually seen a single TOS episode. But, they were the only Trek comics we had before 1979.

This looks like the comic that came with a little microfilm/filmstrip viewer toy I got at Kmart, only in glorious black and white.

http://www.apieceoftheaction.net/2009/10/star-trek-potpourri-spotlight-1967-star.html

And no, I'm not that old! They were still making the thing well into 1975, or else it was new old stock.

I was pretty pissed the story was incomplete and ended on a cliffhanger no less! There were no additional strips to found at Kmart either.

It was around this same time I saw what looked like a Mego Mr. Sulu. (Or was it Chekov?) I asked my Mom to get it, but no dice. (I had most of the figures plus the bridge playset already.) Never saw it again. So, I do have some sympathy for all the people who claim to have seen Luke throw the grappling hook twice in 1977. ;)