Factual error: The bad guys attach over a pound of Semtex to the hull of the First Lady's yacht. When it explodes, the blast shatters the windows in a house a mile away, yet apparently doesn't impact the hull. Even as the vessel burns for 5 minutes, there is no discernible list.
Factual error: The scene of Kokomo, Indiana shows mountains on the horizon. There are no mountains near Kokomo.
Factual error: When Killy slams the senator through the plate glass window to his death, the glass in the window is obviously not tempered safety glass, a requirement in glass elevators.