Revealing: In the scene when when the Red Sea goes together, if you look behind Pharaoh as his troops are being engulfed by the water notice in the background that there are two boulders floating in the water, not being pushed but floating lightly.

Other: When Rameses places the dead body of his son on the statue next to his throne, watch as it cuts to a shot of the side of the statue. A dummy was used in this scene, and it becomes obvious. Check out his hair, which looks like plastic, and his eyes, which look like little circles.