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* ThrowItIn: Matt Lucas ad-libbed the line, "Some of my best friends are bluish".
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* WhatCouldHaveBeen: In the original draft, the Doctor's blindness was cured at the end of the episode. Creator/StevenMoffat [[http://www.radiotimes.com/news/2017-05-20/doctor-who-exclusive-steven-moffat-reveals-the-secrets-of-extremis-2 decided]] that this would have weakened the story, and that the Doctor should remain blind.