> - Large areas of bright colour cause slight horizontal width distortions. 
> (I never understood why the hell CRTs do this, but they undeniably do...)

To do with the power supply I think, if more current is drawn from it for 
the brightness (ie large white areas) then the timing of the beam scanning 
goes a bit wonky due to voltage drops or something.

On a CRT this can be easily seen by flicking between a completely white 
screen and a completely black screen with a thin white border, the physical 
size of outline should obviously stay the same, but it doesn't in practise 
(depending on the qualitiy of the CRT).

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