Continuity mistake: When Bithiah brings the cradle ashore the way the towel on the left is folded changes between shots.
Continuity mistake: When Moses is left alone in the cradle Miriam's left-hand keeps changing positions between shots.
Continuity mistake: The distance between Rameses and Moses alternates from elbow to elbow to about three feet apart as the shots change when the duo are facing Seti during the Ethiopian tribute scene.
Continuity mistake: When Nefertiri and Moses are saying their goodbyes in the cave, his shackled right hand starts to stroke the upper left side of Nefertiri's hair, but the next cut shows Moses' hand lower down.
Continuity mistake: After Rameses slaps the coin out of Dathan's hand, the shot cuts to Dathan being much closer to Rameses. Another instant cut and Dathan is further from Rameses again.
Answer: Although the Bible never states this, it's implied that he got to Mt. Sinai via an alternate route...after all, he did spend 40 days in the desert wandering around without any direction to go to. Afterwards was a different story.
CCARNI ★