Other mistake: The Cyber Leader is supposed to follow the Master's footsteps exactly in order to get across the chessboard. He doesn't. This cannot be classed as a character mistake because the Cyber Leader knew what was involved. I believe this mistake was caused by the actor not being able to see the chessboard through his helmet.
Plot hole: In "The Five Doctors", Susan tells Turlough that she can pilot the TARDIS to some extent. During series 1 and 2, it was clear that she couldn't pilot it at all. She couldn't have been taught between episodes as the Doctor had little idea himself at the time.
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