Theory:Doctor Who television discontinuity and plot holes/Underworld


 * The climax to episode one relies on some very odd ideas about the laws of gravity. Particles of rock would not typically be attracted so rapidly to the hull of such a small spaceship, unless some additional force(s) were at work.


 * How does firing the ships laser canons (presumably in a fixed direction) shift the rock from the whole of the hull?


 * Herrick is shot several times by laser beams, yet not only survives but after he is rescued from the Oracle's lair, appears to be in perfect health, as opposed to all of the guards who appear to die instantly from single shots from similar weapons.