The DVD version of Code Geass R2 episode 18 (volume 7) has been roundly hailed by fans as an exemplary case of a DVD release being done right – the episode brings the animation quality up to a uniformly high level, where previously some doubts were in evidence amongst fans as to the quality.
The comparison above, courtesy of 2ch, shows the changes in excruciating detail.
These have been selected such as to highlight the changes in the most problematic scenes – clearly it is not wholly representative. These are all from episode 18; apparently 17 had no such severe revisions. Mecha designs were apparently all unchanged.
Close examination will reveal all manner of subtle changes.
Some characters even received a complete face-lift:
All that fans have been deprived of in the Geass DVD releases are the previously anticipated ecchi service scenes…