Mr. Waverly refers to the "World Congress of Underdeveloped Countries". Later, Prince Panat calls it the "World Congress of Undeveloped Countries".
In Act iv, as the delegation approaches the trip-wire for the underwater explosive, the waves made by the camera boat ahead of them can be seen.
Early in Act 1, the plane in flight had no airline name on it. It was simply labeled a Boeing 707. This was a Boeing marketing film.
Illya jumps in the water so he can sneak up on the bad guys and take them out, one by one. After he subdues the second one, you can clearly see the man swim off camera.