Other mistake: When Evie is in the library and all the book cases start to tumble over, if you look at one of the corner book cases you can see a piece of paper landing on it and the books are clearly painted on a flat piece of cardboard. (00:13:30)
Other mistake: Evie explains that if Imotep was resurrected he'd bring with him the ten plagues of Egypt. This is followed by (in no particular order) a plague of Locusts, Flies, Water running to blood, the sun being eclipsed and a plague of boils. At the plague of boils Jonathan says 'last but not least, my favourite plague - boils and sores'. How does he know this is the last plague? Aren't there supposed to be 5 more? (01:23:10)
Other mistake: When the locusts attack the camp, you see one of the workers get attacked and killed by them within seconds. Then, you see the Egyptologist covered in them. Why isn't he getting attacked and killed by them as well? You'd think that, just like the scarabs, they'd never stop eating.
Other mistake: At the hotel after the American has been relieved of his eyes and tongue and the motley crew realises the "waters" have turned to blood, Rick encounters Evelyn outside and behind her is a sign for "offices" that seems a bit too modern for the times.