When Solo hits Ingo with the two parts of the wooden bar, he smacks Ingo on both sides of his neck. However, Ingo reacts by grabbing his ears in pain.
Two of Alexander's men riddle the airplane hanger with bullet holes while shooting at Kuryakin. When the men arrive at the hanger, the bullet holes are missing.
The hatch remains open as Solo fights Alexander to get on board the escaping airplane. As the plane takes to the sky, the door is now closed.
Near the end of act 1 the Dage TV monitor on the desk shows the surveillance picture of the spa in color. These monitors are black and white. Also the picture moves off the screen a bit as if it were superimposed.
Plane exploding is same shot of helicopter exploding in "Brother Love."
In the fight between Solo and Ingo, studio lights are briefly seen above the set walls.
When Illya, wrapped up as a mummy, falls onto Mr. Koval (thus saving Solo's life), in the next shot you can spot the mattress he (or the stuntman) fell onto. Look in the bottom left corner of the screen. It's also in following shot.
Obvious stuntman driving instead of Illya when chasing the plane.