I recently report an error with the title of a Guanajuato digitized film, and received a very nice reply:

From: Support
To: gpf13
Subject: Mexico, Guanajuato, Catholic Church Records, 1576-1984: error in source listing
Date: Tue, Aug 23, 2011 11:44 am

Dear George Fulton,

Thank you for contacting FamilySearch to report incorrect dates given for our
collection , Mexico, Guanajuato, Catholic Church Records, 1576-1984, San
Francisco del Rincón, San Francisco de Asis.

We have reported the error for correction.

We appreciate you for taking the time to supply feedback about your experience
using our Historical Records collections at FamilySearch.Org. It is due to the
diligence and caring of persons such as yourself that is helping to make
FamilySearch a premiere genealogical site.

We invite you to return often as new collections are being added regularly.

Sincerely,
FamilySearch