Factual error: It is roughly 120-135 dB inside of a C-130, especially one that hasn't been specifically modified. It is so loud that it is painful to be in the cargo hold without hearing protection (besides it being outside of military regulations) and you certainly couldn't have a normal conversation while it was in flight.
Factual error: When Cruise and Wallis are in the underground tunnel beneath London they are walking along the tracks before a Tube train blasts through. The 3rd rail is missing, which carries the electricity for London Underground trains and would have electrocuted them both if it was there as it should be.
Factual error: As the plane is crashing, it is shown in a nose dive, but the actors are shown rolling around in it like a barrel. Everyone should have been piled up against the cockpit bulkhead.
Factual error: Jenny dates the sarcophagus as 5000 years old and explains later that the hieroglyphs are from the New Kingdom which dates from 1550 to 1070 BC - just around 3000 to 3500 years before.