"OH MY GOD!"
Did anybody else notice someone (I couldn't make out which character) screamed out "OH MY GOD!" when some of the buildings fell down during the early stages of the eruption?
The Romans (including the Pompeians, who were Romans, btw., the notion of them being a separate ethnicity than the Romans was made up by this movie and is not historically accurate) were polytheistic. It wouldn't make sense for them to shout out "Oh my god!" in singular tense ;)