Zavaterro mentions that the mysterious "brotherhood" trying to stop them are "...direct descendants of the family of Noah." However, if one interprets the flood myth literally, every human being is a descendant of Noah because his is the only family that supposedly survived.
The Coelacanth was never thought to have gone extinct 70,000 years ago, as stated. It was thought to have gone extinct at the end of the Cretaceous Period, about 66 million years ago; until discovered alive in the Indian Ocean in 1938.
Any locating system which uses the position of the sun (such as the shadow of a staff) can only be accurate on specific days of the year (usually there are two such days) as the sun's apparent motion takes it from one solstice to another.
The US Flag patch worn on the right sleeves of the army personnel was reversed.
Lord Carnavon, sponsor of the excavation of the tomb of Tutankhamun, did not die of mold, fungi, etc. encountered in the opening of Tutankhamun's tomb, as suggested at the start of the movie. Rather, he died months after the tomb was opened, of an infected mosquito bite.
Tiny Lister's character is repeatedly referred to as "Major" or "the Major" (O-4) even though he is wearing Sergeant Major rank (E-9) on his uniform. However, Army enlisted may sometimes shorten "Sergeant Major" to "Major" when officers are not present. This really is a goof. Army Enlisted Soldiers do NOT refer to their Sergeants Major as just Major. Also, the civilian characters would not know this supposed shortcut.
To make the miniature village in the tomb requires a knowledge of perspective and scale which was not discovered until the 14th century.
Basing a plot point on a solar alignment that is thousands of years old is always a big mistake because of shifts in the relative positions of the earth, sun and other bodies over time. The error here is compounded by the fact that the exact length of a biblical cubit is unknown (they needed a four-cubit tall staff to create the pointer shadow).