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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Single unrecognized character wrecks entire display
Date: Wed, 22 Aug 2012 11:01:04 -0400
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> Is there a way to quickly spot the offending character within Emacs in
> such cases?

Good question.  Please send it as a feature request via
M-x report-emacs-bug.

As for an answer, it might be that C-x RET r utf-8 RET might do the
trick (basically, the single offending byte caused Emacs to decide that
the file is not using utf-8 and read it as a binary file; so by
forcing the use of utf-8 you should get all the utf-8 encoded chars to
appear correctly and the invalid byte to appear as \234).


        Stefan