One thing about "Operation: Annihilate!" that always bothered me. When Spock is hit with the blinding light. Why doesn't he immediately cover his eyes? (I know it's contrary to the script) I'd bet if you ran a hundred people off the street through that thing, that they'd all put up their hands to shield their eyes.
Tonight's episode on TV: (unfortunately) "Spock's Brain"
It's only redemption was McCoy's joke near the end about reconnecting Spock's mouth.