Factual error: During Moses' comeback from his Ethiopia campaign, as soon as he presents himself to Pharaoh Seti, he says, "I bring you - Ethiopia!" This is an anachronism, as Ethiopia was known as ABYSSINIA in ancient times much like Siam was to Thailand and Ceylon was to Sri Lanka.
Suggested correction: This is an example of translation convention. In real life, Moses would been speaking Egyptian or Hebrew. This is being "translated" into English for the audience in a way that they can understand. This is similar to when some Bible translations translate something like "the third day of the week" to "Tuesday." It's not incorrect, it's just translation.
Continuity mistake: When the movie ends, Moses places both hands on Joshua's head. From the opposite angle they're away. (03:43:50)
Continuity mistake: When the movie ends, Sephora rests against Moses' shoulder and places her left arm on his body. From the angle shot from behind, she is away from him and her left arm is signaling the horizon. Back to the front shot, and she is in the previous position.
Continuity mistake: Before Moses parts the sea waters, he cries, "Behold his mighty hand!" and extends both arms, his staff covered by his cloak. From the angle shot from behind, the staff is now over the cloak.
Other mistake: When Nefritiri rushes to Moses and cries, "I will not live if you must die," in the next shot as Ramses pulls Nefritiri away, the dark outlines of Charlton Heston's modern-day briefs are visible under the ragged garment he's wearing. (01:35:25)
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.
Audio problem: After the Red Sea parts, and almost all of the Hebrews are across the dry expanse, the pillar of fire holding Pharaoh back disappears, and the chariots head into the expanse themselves to pursue the Hebrews. A very young Hebrew boy at the rear of the masses says 'Look, Grandpa! Pharaoh and his men are coming!' and points at them with his free hand. Watch his mouth: the child is merely moving his lower jaw up and down. Apparently the child actor was too young to learn any lines so the producers improvised.
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: At the end when Moses reaches out to the tablets, in the first shot he has nothing in his hand, second shot he has something black which at first looks like sunglasses, and in the third shot his hand is empty again.
Continuity mistake: When Sephorah first talks to Moses, she is touching the rope holding the bucket over the well. She's not touching it anymore in the next shot.
Continuity mistake: When Moses is exposed as a Hebrew, Sethi is holding his scepter up in his left arm, and Nefretiri tosses her feather to the ground. In the next shot, Sethi's scepter has vanished.
Continuity mistake: When Nefretiri is told by Memnet that there will be a Hebrew on the Egyptian throne, she lowers the cloth that she is holding. In the next shot, she is holding it up higher again.
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: 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.
Revealing mistake: When Bithiah names the baby Moses the clouds behind remain motionless for minutes revealing it's a backdrop.