I believe that "wrong" usage of "whom" and certain pronouns in the "wrong" positions is a natural consequence of there being no actual strong pattern to their usage outside of grammar books.
"Haitch" is seen as a kind of low-level thing to say, isn't it?
Other examples posted here all seem more like examples of buggering up, rather than hypercorrection. Perhaps the "awfully" example might be an exception, but the others don't make me think "Hmmm, sounds sorta posh" particularly.