I have to agree with a previous observation. Character development was still ongoing in season one, most noticeably for Spock. We see far more emotion in the form of smiles, smirks, raised eyebrows, shouts, tears, and incredulous looks from everyone's favorite Vulcan in S1 than in both of the other two seasons combined. A nod also to the comparison to modern naval command protocol in giving orders, although again we see it in Spock pretty much only in S1, if memory serves.