What are those minor tweaks you think they could have made to episodes to have made them so much better? A couple immediately spring to mind...
"The Menagerie"
They passed up an easy opportunity to explain why Spock's characterization in "The Cage" was so different. While they're watching the replay of the Talos IV mission, Dr. McCoy should have teased Spock a little about how emotional he's acting, "Almost human." Spock would then give a mildly embarassed reply that this was in his uncontrolled youth and that he has since mellowed with age. It would have made an early pilot mistake seem like deliberate characterization.
"What You Leave Behind"
The last line of the series ("It's like I always say, the more things change, the more they stay the same.") should have been said by Morn.
"The Menagerie"
They passed up an easy opportunity to explain why Spock's characterization in "The Cage" was so different. While they're watching the replay of the Talos IV mission, Dr. McCoy should have teased Spock a little about how emotional he's acting, "Almost human." Spock would then give a mildly embarassed reply that this was in his uncontrolled youth and that he has since mellowed with age. It would have made an early pilot mistake seem like deliberate characterization.
"What You Leave Behind"
The last line of the series ("It's like I always say, the more things change, the more they stay the same.") should have been said by Morn.