The Learjet 24A used near the end of the film changes tail numbers from N1972A to N1969A.
Darrow enters the Lear jet, sets the tracking device down, and flips the switch to the "up" position to activate it. The next time that we see the tracking device, the switch is in the "down" position.
In the scene supposedly in London (obviously a set in Hollywood), a neon sign reads "Jewelers", with the American spelling. A real British sign would read "Jewellers".
At 1:22:30 - The soldiers are riding vehicles labeled "UN", which means that they should be wearing blue helmets of the UN peacekeeping military.
Toward the end of the film, Mount Ararat is shown as a sharply defined mountain like one found in the Rockies or Sierra Nevada. The actual Mount Ararat is an inactive volcano that last erupted in 1940. Similar in shape to Mt. Hood in Oregon, the mountain has two cones named Greater and Little Ararat that are eight miles apart and almost a quarter mile difference in height . Ararat is the tallest mountain in Turkey with an elevation of 5,137 m or 16,854 ft.