Point I was making is an earthquake is not mentioned in Genesis.
I assume you mean "Exodus" and that was just an unintentional slip. In any event, a certain amount of dramatic license is allowed when making a two hour biblical movie as long as it is consistent with scripture. There was lots of non-biblical material included in the movie "The 10 Commandments". If the authors want to suggest God used an earthquake to part the sea that doesn't bother me - especially if it occurs in response to Moses' lifting of his rod.