The German terrorist who Wahl shoots mid-air on the ski slope suddenly doesn't have his skis on anymore when he lands.
During the KGB Training Camp scenes in Minsk there is an AM General M715 and a late 1970s GM station wagon seen in the camp.
About 7 minutes from the very end, the soldier's Porsche crosses the Berlin Wall via a car transporter-style ramp. In a continuous shot, the front of the Porsche hits and knocks off part of the top of the wall but is completely undamaged.
In the opening stunt you can see that the actress is clearly a stunt man when his wig comes off.