I imagine it is something like this:  An Issue would be something like a race condition, a detail might be something like a slight inconsistency in naming of attributes.<p>See also: <a href="http://en.wikipedia.org/wiki/Parkinsons_Law_of_Triviality" rel="nofollow">http://en.wikipedia.org/wiki/Parkinsons_Law_of_Triviality</a>