Here's something:
I counted the number of viewable revisions prior to 19:50, 3 June 2006. There are 1109, which is equal to the number restored by Musical Linguist. If "Musical Linguist deleted the article and restored all but one revision (or possibly a handful) to remove personal information (I'm guess that's what PI stands for), and then the next day Jayjg restored that revision(s) too", then the number of revisions would be greater than 1109.
So it appears something *was* oversighted. This doesn't say anything about what it was, though.
I agree, that's definitely something. There might be another explanation, but I can't think of one (it is 3:20am here, though, so that's not saying much). Might be easiest just to ask an oversighter to check the logs...