Theory:Doctor Who television discontinuity and plot holes/The Face of Evil


 * In Part Two, how does the Doctor know where the bridge into the wall (through the teeth) is? (He doesn't remember his last visit until after they've entered the wall - if there's anything to remember anyway; he seems surprised when Leela asks how a signal can be getting through, although this may be because he can't remember the concept at that point!)
 * He figured out it was a beamed transmission and tracked back the beam. And he probably guesses the teeth is the way to go because it's the most obvious place.


 * The scene in episode one where the Doctor uses the alarm clock to divert Xoanon's id creatures seems to imply that they walk and have feet with which they stomp on things. Yet the climax of episode three shows that they are only disembodied floating heads.
 * They are manifestations of Xoanon's subconscious, making the form they take infinitely mutable.


 * At the end of Episode 4, how does Leela know how to operate the controls?
 * She doesn't. It appears that she is pressing any controls, wondering what they are, her being so primitive. Plus, The Doctor knows that she shouldn't "touch that", yet she clearly doesn't.''