Some things I took note of:
-I forgot that McCoy wasn't in it and that Hotlips Hoolihan was.

-Sulu makes mention of pennies and no one asks what the fuck they are.

-They have fully automated space stations that only get visits every 20 years.
-The first damage we see in Star Trek are exploding bridge consoles.

-They make no mention of Starfleet and Spock refers to things we would consider Starfleet as "Human".
-I'm glad they moved away from the funky turtlenecks, but I didn't see any Red shirts.
-The original phaser pistols are way cooler looking than the black ones. Also the rotating cocking mechanism on the phaser rifle made me laugh.
-Shatner's trademark acting style is born in the very first episode in the forced praying scene.
-As is the first rule of Star Trek... Torn shirt Kirk never loses.

-The original communicators were fucking huge.
-It is the only Star Trek episode where I can remember anyone having a bandage on.
-There were no mini skirts to be seen.
-I also forgot that Uhura and Chekov hadn't made their first appearances.
All in all, I have to say, it was still enjoyable to watch and didn't really seem old or stale even after 30+ years. I wonder how the series would be received today if it was new? Would it be changed so much that we wouldn't even recognize it?