A fresh example of a nominative object of a preposition, noticed by Wilson Gray in the NYT opinion blogs (“The Two Julias” by Candice Shy Hooper on the 14th):
Jule must have wondered at a world in which any other slave in the South but she could find freedom in General Grant’s camp.
Wilson tried to attribute this error to a computer glitch, finding it hard to credit in otherwise literate prose. But of course it’s an error of nervous cluelessness (as Mark Liberman and Geoff Pullum have labeled it on Language Log), a type of hypercorrection that depends on a confusion between grammatical categories — in this case, preposition but (which takes an accusative object) and conjunction but (which combines with a clause, with nominative subject).

