Factual error: When the boat is burning Rick tosses his bag of weapons over the side and it floats. This despite the fact that the obviously heavy bag bangs down onto the table in front of Evie when the two characters talk shortly before the fire - it is full of heavy guns and ammunition and the thin, porous canvas cover forms a roll around the heavy contents. There is absolutely no way it would trap enough air to balance the many kilograms of metal. The bag would sink like a stone when it hits the surface of the water.
Visible crew/equipment: In the scene where Rick is beating up Beni in the Egyptologist's office, as Rick throws him on the desk, there is a flash of light that has no visible source, and a metallic clink can be heard off to the right. (01:17:50)
Deliberate mistake: When they first enter the tomb, Evie moves a mirror which deflects light onto a load of other mirrors. You can see the beam bounce from mirror to mirror as it goes along the chain. Whilst this looks cool, the speed of light is far too quick for this to actually be noticeable as shown.
Continuity mistake: Just after the bug has crawled up into the guy's head, you come back to where Rick and the others are. You see that Rick is wearing those wrist bracers. When they hear a scream they go running. In the next shot Rick does not have the bracers. (00:47:40)
Continuity mistake: After the scarab enters his body, Jonathan contorts his arm in pain/reaction giving a view of his palm, through which the scarab entered. But there is no visible wound, blood, or any other sign of entry for the scarab to have gotten in. Also there is no visible blood when Rick stabs Jonathan to get the scarab out.
Continuity mistake: On the boat, as Rick is checking his weaponry, he cocks his 45 and puts a magazine in. Hearing a noise, he walks over to deck cargo and pulls Benny out. He then places the 45 against Benny's chest and threatens him. The 45 is no longer cocked.
Continuity mistake: When Rick finds Beni in the office, after Beni says "I am immune", Rick slams him into a pile of boxes, sending stuff flying. Nothing is visible behind Beni's head, just a sheet of paper at neck level. Then after Rick says "immune from what?" we cut to a different angle - boxes are now piled much higher behind Beni, and there's a bit of paper resting on his hat. (01:15:00)
Continuity mistake: In the scene when they are driving through town trying to escape the mob, the car crashes, and you can see that its lights are on. When Rick helps Evie out of the car, its lights are off. A few seconds later, you can see in the background that its lights are on again. (01:27:20)
Deliberate mistake: The shot of Ardeth and his companions watching Rick leave Hamunuptra at the start of the film is reused again when Rick, Evie, Jonathan and the Warden re-enter Hamunuptra, although the reused shot has a blue filter over it. Ardeth even says exactly the same line he says in the original shot, but it is subtitled differently.
Continuity mistake: Whenever a scarab crawls out of its "blue gold" shelling, it leaves the shelling behind. At the end of the film when Jonathan picks one up and the scarab crawls inside of him, he begins to scream and you can see the shell still on his hand yet in the next shot, he throws his hands up yet no shell is thrown away or even seen on the ground. (01:37:00)
Continuity mistake: In the beginning, during the initial battle sequence, there is a scene where some men on horses go up a little hill, over all these dead bodies. The body right in the middle of the shot jumps two different times when a horse runs over his legs.
Revealing mistake: When Imhotep transports Evie, Beni and himself back to Hamunaptra, Evie hears the plane and looks up. Before she states "O'Connell," you can see the letters and numbers on the side of the plane are backwards, like a mirror image - it says "B5538" backwards, which resembles "BE228" (no mirror). (01:32:15)
Continuity mistake: When the hero and heroine are kissing, you first see it from behind him looking at her face. From that viewing angle they both turn their heads to the right to kiss each other. Then we see it from behind her and in front of him, but now they are both turning they heads a little to the left.
Continuity mistake: When the fat guy who gets the beetle in his brain runs into the wall, his shirt is untucked. The camera changes angle and it is tucked in. (00:47:50)
Revealing mistake: In the initial battle sequence, in one shot you can see the special effects canister from which the sand explodes up.