Scotty: On Earth, we have a saying: Fool me once, shame on you. Fool me twice, shame on me.
Chekov: I know this saying. It was invented in Russia.
Many of the "onlies" in the final scenes of this episode were the children of Star Trek's cast and crew. They included William Shatner's two young daughters, Leslie and Lisabeth Shatner. See more...
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Factual error: If Miri's planet is a "duplicate" (meaning identical) Earth, it should have clouds. It doesn't. This remains a mistake because "duplicate" means "exactly the same," and thus the clouds should be there. The special effects crew forgot to put them in. Noteworthy: the very first thing fixed in the digitally enhanced version of this episode was the duplicate Earth. It has clouds now.