Re: Episode 8, "Miri"
"Miri" was also one of the first episodes to present Roddenberry's concept of parallel cultural development, which was just an excuse to use existing sets and costumes in studio assets. Perhaps they were still trying to figure out how to present the parallel concept. The physically identical planet was a bit of a stretch, just like the word-for-word "We the people" documents and star-spangled banner in "Omega Glory".
Curly: Moe, Larry, the cheese! Moe, Larry, the cheese! (Horses Collars, 1935)