Paying Homage
So maybe you forgot, but in the film there’s a Fort Brydon. Yes, that’s a made up place, but it has significance. In fact, Stephen Sommers also directed The Jungle Book (1994). In that movie, there’s a Colonel Brydon, so he wanted to pay homage.
Historically Inaccurate
Maybe you caught this one, but The Book of the Dead and the Book of Amun-Ra resemble modern books. They were black stone and gold tablets bound together. However, you probably know from history class that the Ancient Egyptians used papyrus scrolls. Also no book would be made of pure gold. Think of how heavy that would be!