Factual error: When Brendan Fraser & his son are running to reach the pyramid before the sun hits it, the sunrise line approaches the pyramid along the ground, but the sun would naturally have hit the pyramid at the top first and worked its way down to the ground. [Some people insist on trying to correct this - think of it this way. If the sun's illuminating the ground from way up in the sky, what's keeping something higher up than the ground in darkness?] (01:34:40)
Other mistake: How would Alex know that Imhotep's water wall took out his parents? The matter of distance is debatable. But, the winding path that the dirigible took though the canyon, as well last the water wall, would block his vision.