If the following could be activated on the wiki-site it could maybe make for a better diff?

http://www.mediawiki.org/wiki/Visual_Diff

I ran an example of the text on a mediawiki installation I run and this is the result:
http://sanitarium.se/w/index.php?title=Test&diff=3&oldid=2&htmldiff=Visu...

The Visual Diff page has a link to a java app that can do these kinds of diffs in a script.