frank678 said:
I never would have spotted this, has it had a noticable effect on the compositional flow of the sequences now you watch it over again or is it more a semi-conscious thing?
Judge for yourself: http://www.sendspace.com/file/3skuge
It's from when the distortion first appears, now corrected.
Top: DVD Bottom: corrected
It does make a difference in that it makes objects that should be circle-shaped appear circle-shaped instead of being egg-shaped etc, the difference is actually big enough that you can also notice it on the faces of the actors sometimes, at least on a direct comparison.