Revealing mistake: When the president is thrown out of the window by Carpathia, it is obviously just a CG shot. Not only is the president obviously CG, but the glass from the window breaks into neat little triangles. Right.
Visible crew/equipment: During the assassination attempt scene, President Gerald Fitzhugh is thrown from the blazing limo and lands on the pavement. When he begins to get up, watch closely and you'll be able to see a blue blanket that was placed on the ground to protect the actor as he sat on the pavement.