- Hostility on the Set: During the location shooting for this episode, the new producer John Meredyth Lucas visited the set, accompanied by Gene Roddenberry. Lucas was struck by the tension and bad atmosphere among the cast. "Shatner came around the corner, and when he saw Gene, he turned around and went the other way. And the cast was fighting too. All the actors complained to me about all the other actors."
- Writing by the Seat of Your Pants: Gene Roddenberry revised the shooting script as the episode was being filmed. Director Ralph Senensky remembers picking up the day's script pages when arriving to the set in the morning.
Trivia / Star Trek S2 E25 "Bread and Circuses"