In v3.2 if you turn off basename display in the "customize the display of this page" on an entry editing page, when you change the title it kicks an onchange event which shows an error that "null is not an object". the error is probably a result of the javascript portion in the function init in the code below. It seems to not be checking var basename in the if statement correctly.

CODE
function init()
{
    // setup
    tbTableSelect = new TC.TableSelect( "manage-trackbacks" );
    tbTableSelect.rowSelect = true;
    cmtTableSelect = new TC.TableSelect( "manage-comments" );
    cmtTableSelect.rowSelect = true;
    var basename = getByID("basename");
    var basename_old = getByID("basename_old");
   var title = getByID("title");
   if (basename) {
       if (basename.value != '') {
           orig_basename = basename.value;
       }
   }    title.focus();
}



Later on when the title's onchange is fired it calls setElementValue which is where the error occurs.

CODE
function setElementValue(domID, newVal) {
   getByID(domID).value = newVal;
}