When Andrus (K.D.) arrives at the hospital to visit Kruger (E.G.R.), the tie knot gets much lower on entering the bedroom.
In most of Jack's driving scenes, his steering inputs, or lack thereof, don't match what's going on in the rear-projection background. This is most obvious when he goes on his drunken, reckless drive with Carlotta as his passenger.
At the end, Jack Andrus is late boarding a plane. He rushes up the stairs, and the door closes. But the door is not sealed; it remains closed but not sealed.
While shooting the film, after Jack kicks Barzelli to stop her temper tantrum, he directs her to "reach for the ring" and she immediately does so before the translator has given her the instruction in Italian.