Revealing mistake: In episode four, the camera wobbles when the Doctor brings the gun to Stael.
Other mistake: Several shots are repeated during the implosion of the priory.
Continuity mistake: The TARDIS is missing its light the first time it's seen.
Continuity mistake: In the opening TARDIS scene, after the TARDIS lurches from the time scanner, the Doctor's hat rack can be seen standing upright. Then Leela picks it up in the next scene.
Answer: In 'The Five Doctors', three separate Cyberleaders are definitely used. So it's likely that Cyberleaders are like unit commanders, of which a fair-sized army might have several.
Daria Sigma