Also, can you provide an example where the lack of a serial comma introduces ambiguity that cannot be resolved by simply re-ordering the named items in the series?
OK, this could easily be resolved by re-ordering the list, but a classic example of a sentence needing the Oxford comma is the following:
"Present at his funeral were his two ex-wives, Frank Sinatra and Sammy Davis, Jr."
Re-ordering the list wouldn't actually resolve the ambiguity, because it would make the antecedent of the second 'his' unclear.