All There in the Manual: The names of Tzipporah's younger sisters (from oldest to youngest): Ephorah, Ajolidoforah, and Jethrodiadah.
Secular Egyptian history names Seti I's wife as Tuya, which is what many fans call The Queen in this film.
Banned in China: The film was banned in the Maldives, Egypt, and Malaysia because of Islamic custom of never portraying the image of the prophets. In Egypt, it was also because of the villainous portrayal of Pharaoh Rameses, a well-respected historical leader whom the Egyptians hold to be separate from the Pharaoh of Exodus.note For anybody who's interested, historians say the Pharaoh of Exodus could be either Dudimose, Ahmose I, Thutmose III, Horemheb, Ramesses I, or Ramesses II, with both Dumidose and Ramesses II being the least supported theories among scholars in the field and Thutmose III being the most supported. The debate continues to this day.
Doing It for the Art: The film was a truly sincere effort by DreamWorks Animation to try and make a great movie, hence why there was little merchandise made for the film. They even consulted many religious groups to give the A-OK to the story material.
Non-Singing Voice: Averted with Ralph Fiennes (Rameses), Steve Martin and Martin Short (Hotep and Huy), and Michelle Pfeiffer (Tzipporah), all of whom did their own singing. Oddly enough Val Kilmer did not do his own singing, even though he has a really good voice and has sung in other movies he has made.
Playing Against Type: It is a bit unnerving to hear Patrick Stewart (as Pharaoh Seti) justifying murdering thousands of innocent Hebrew babies in that soothing Team Dad voice.
You'd think that Hotep and Huy, the two high priests, would be comedy sidekicks in the vein of Aladdin's Iago or The Lion King's hyenas. Steve Martin and Martin Short do voice them, but Egypt is a rare instance of two comic legends playing their roles absolutely straight. They are humorous, yes, but their biggest laugh (trying to demonstrate how the water could turn to blood) is but a counterpoint to a horrifying situation.
It was planned to combine the voices of a man, a woman, and a child for the voice of God. But they had Kilmer voice God instead because it was thought some might have problems with God sounding female. That and the fact that their synthesized composite voices apparently sounded much more demonic than Godly.
A scene with a talking camel was scrapped and Rameses was originally supposed to have two evil cats. Granted, these and the camel would have run totally counter-current to the mood of the film as a whole. Curiously, the camel did eventually show up in the form of a piece of merchandise for the film, as a little beanbag doll.
Moses also originally had two dogs as his side-kicks. Though they were later scrapped from the film as a whole, you still see them two times (in "All I Ever Wanted").
Jeffrey Katzenberg pitched this idea to Disney several times during his tenure there, but CEO Michael Eisner kept rejecting it.
Ramses was much more sympathetic in the original script, until the crew realized this made Moses look like a jerk for refusing to work with him to help the situation.