Continuity mistake: When Moses asks Rameses where extra grain can be found to feed the slaves, look at Joshua. In the next shot, a guard suddenly appears in front of him.
Continuity mistake: When Rameses is asked by Moses if there is any extra grain to feed the slaves, Rameses' pose changes between shots.
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 ★