Penn State press: question about Chaucerian version dangers

[Heather Morrison <hgmorris@sfu.ca>]

Sandy Thatcher wrote:

Maybe this would be acceptable if all one were doing was 
discussing the basic ideas conveyed in an article and citing the 
VoR as the source, but it would be dangerous to rely on the 
postprint solely and quote from it since the final editing may 
well have caught errors and made other changes in the 
peer-reviewed draft.

Question for Penn State press:

Looking at the list of Penn State journals, I am puzzled about 
what exactly the dangers would be of reading or citing a 
postprint.  For example, what would be the danger, exactly, of 
relying on a postprint of an article from Chaucer Review?

Misinterpreting Chaucer, perhaps?

Sandy Thatcher's post:
http://www.library.yale.edu/~llicense/ListArchives/1001/msg00121.html

Heather Morrison, MLIS
The Imaginary Journal of Poetic Economics
http://poeticeconomics.blogspot.com