In the
script, the "Laughing Crewman" who paints "LOVE MANKIND" on the wall
was supposed to later encounter Mr. Spock after he contracted the
affliction and paint a moustache on his face, but Leonard Nimoy
objected and the scene was scrapped.
Mr. Spock
mistakenly refers to Mr. Leslie as "Rand".
Footage of
Uhura at the navigation console had previously been used in
"The Man Trap".