Story and production:
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Revision as of 05:42, June 19, 2016
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* Because the script still needed a large amount of rewriting when photography on "Dagger of the Mind" was completed, production shut down for two days (plus a weekend) before the filming of this episode. This also allowed some prep time for director [[Vincent McEveety]], who directed the two episodes back-to-back. (''[[These Are the Voyages: TOS Season One]]'')
* Because the script still needed a large amount of rewriting when photography on "Dagger of the Mind" was completed, production shut down for two days (plus a weekend) before the filming of this episode. This also allowed some prep time for director [[Vincent McEveety]], who directed the two episodes back-to-back. (''[[These Are the Voyages: TOS Season One]]'')
* McEveety directed this episode from a wheelchair, as he had broken his leg in a home accident (previously incorrectly stated as a skiing accident) a few days prior. (''[[The Longest Trek: My Tour of the Galaxy]]'', p. 103; ''[[These Are the Voyages: TOS Season One]]'')
* McEveety directed this episode from a wheelchair, as he had broken his leg in a home accident (previously incorrectly stated as a skiing accident) a few days prior. (''[[The Longest Trek: My Tour of the Galaxy]]'', p. 103; ''[[These Are the Voyages: TOS Season One]]'')
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* The initial mystery of how an "exact duplicate" of Earth came to exist -- right down to the shape of the continents and the architecture of the buildings -- is never resolved. In fact, after the first ten minutes of the episode, it is simply never referred to again. This was not a case of an explanation having been cut for time, even at the script stage. The mystery was not resolved in Spies' original draft script, nor in subsequent drafts by John D.F. Black of Gene L. Coon.
* Clocking in at a minute and ten seconds, this episode's teaser is the shortest of any in the original series.
* Clocking in at a minute and ten seconds, this episode's teaser is the shortest of any in the original series.