Continuity mistake: When Moses and Joshua are reunited and Moses denies God's purpose for him (he says "I am not the man"), Moses has his arm around Joshua's back. In the next shot, Moses is only touching Joshua on the shoulder.
Continuity mistake: When Seti orders that The Deliverer be summoned, he hands the bottle that Rameses gave him earlier without looking at him. In the next shot, he is looking at Rameses.
Continuity mistake: When Seti is told by Rameses that he has caught The Deliverer, Seti is looking at Rameses. In the next shot, Seti is looking straight ahead.
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 ★