Where did you chaged Mr.Houdini?

gistfile1.py

import hou

def where_did_changed(node):
    for child in node.children():
        for parm in child.parms():
            try:
                value = parm.eval()
                index = parm.componentIndex()
                cvalue = parm.parmTemplate().defaultValue()[index]
                if value != cvalue:
                    print "%s %s -> %s" % (parm.path(), cvalue, value)
            except:
                pass

            
        where_did_changed(child)

where_did_changed(hou.node("/"))