During the filming, Gene Roddenberry
was in a panic because he needed at least two female identical twins and couldn't find any. Then one night while driving home he saw Alyce Andrece
and Rhae Andrece
walking down a street. Roddenberry literally pulled up beside them, jumped out of his car and told them that they were going to be on television! See more
When Norman enters Engineering and Scotty is slugged, Scotty falls back and clutches the end of the control console near the comm station. A close-up shows Scotty warning the Bridge from that station. But in the next wide shot of Norman dispatching the rest of the Engineering staff, Scotty is not there. We then get another close up of Scotty passing out at the comm station. See more
Well, you must be very unhappy, Mr. Spock.
That is a human emotion, Doctor, with which I am totally unfamiliar. How could I be "unhappy?"
Well, we found a whole world of minds that work just like yours - logical, unemotional, completely pragmatic - and we poor, irrational humans whipped them in a fair fight. Now you'll find yourself back among us illogical humans again.
Which I find eminently satisfactory, Doctor, for NOWHERE am I so DESPERATELY needed as among a shipload of illogical humans.