Other mistake: In the last scene of the episode, the opening shot is a Boeing 707 in flight. The 707 logo on the tail is backwards. It appears they flipped over a piece of film stock from a shot earlier in the episode, where the same plane was flying in the opposite direction.
Other mistake: Aboard the plane in the beginning, Illya calls to report in, and forgets his own secret agent number. He tells the communicator, "This is Number 2 Section 1." This is a little like James Bond suddenly calling himself Double-O-Six. Illya worked for Section 2, and was always Number 2 Section 2. Maybe that's just what happens when you're a TV spy and get hit over the head too many times.