There is a --dif (instead of --diff) for prepare-ChangeLog and a -clean (instead of --clean) for build-webkit. In addition, a nice rule to follow when laying out items is that if ordering doesn't matter, then sort them and the script doesn't currently do that for the many lists in it.
Created attachment 32997 [details] Proposed fix.
Committed as http://trac.webkit.org/changeset/46076