Looking at this file using hexl-find-file, one can see that formatting
codes are inserted in the output.  See from byte 0xad for example.

The coding system is set in man.el by:

	    (coding-system-for-read
	     (if default-enable-multibyte-characters
		 locale-coding-system 'raw-text-unix))

So the coding sytem is utf-8-unix on my system.  The aforementioned
formatting codes seem as if they are being interpreted as utf8-encoded
characters, causing the output from earlier in this bug report.

-- 
Michael Welsh Duggan
(md5i@cs.cmu.edu)