Revealing mistake: Illya flies a helicopter to the Himalayas in search of Solo, and at the same time, Kingsley's men are loading an unconscious Solo into another copter. Not only do the two helicopters look suspiciously similar - they have the exact same registration number: N73959.
Revealing mistake: During the foot-chase through Tenza HQ, the Thrush gunman, with Illya in hot pursuit, races around a hallway corner. As Illya runs into the shot, the gunman's shadow reappears on the back wall, revealing the fact that the actor has stopped and is standing back there. Next shot, though, he's running down another corridor and through a door.
Revealing mistake: When Napoleon and Illya are on the flight to Austria, Illya receives a call from Mr. Waverly on his communicator. Instead of the pen nib, the gold microphone cap is visibly already in place; Illya takes it out and pretends to turn it over before replacing it.