It's noted that Coon (writing as Lee Cronin) intended "Spock's Brain" to be totally serious given it was inspired by the issue of organ transplants then in the news at the time as well as Coon knowing that GR was dead set against anymore comedy on the show. Everyone seemed to think this story was a genuinely interesting idea with potential, and they're right. But they seemed to have run into problems because people like Roddenberry, Fontana, (as well as Coon) and others were no longer on hand to properly work these episodes to iron out the more greivous logic flaws and less-than-inspired ideas. Freiberger and Singer were simply out of their depth with the kinds of stories TOS dealt with which were definitely beyond conventional TV fare.
Apparently Justman was the one who noticed the possibilities for humour in this story and suggested such in which Coon was only happy to comply. But Justman had a change of heart and went back to siding with Roddenberry and the humour was dialed back though not completely excised.
Apparently Justman was the one who noticed the possibilities for humour in this story and suggested such in which Coon was only happy to comply. But Justman had a change of heart and went back to siding with Roddenberry and the humour was dialed back though not completely excised.