Just read what I think was the first ever Star Trek comic, published by Gold Key for 12 cents God only Knows When.
We've come a way since then.
Just for instance, now we don't like to kill whole ecosystems like Kirk does at the end of this charming little number, and Kirk certainly didn't run around shouting, "Galloping Galaxies!"
On the flip side, some of it was startlingly familiar - Spock saying how they needed to be exactly precise on some measurement against all odds or so-and-so would die horribly and actually managing to pull it off, Kirk's nonsensical, sentence-free logs, and pretty much all of McCoy's character are pretty much straight out of early Season 1.
But possibly the biggest blast from the past (and most annoying) was when they were exploring another galaxy (presumably after Gary Mitchell was done with them) and finding no signs of life.
Ah, the days when canon was nothing and we were carefree and innocent.