Here's one example of bad dubbing for American
release of Godzilla.

The voice of Dr. Daisuke Serizawa-hakase is not
the same when dubbed in English.

Compare the voice when he is on the phone with
Steve Martin to the voice when he is on the stairs
with Emiko after showing her the Oxygen Destroyer
and says " The world must not know of this. Keep
my secret."

Entirely different.