In the opening sequence Mr. Solo takes a standard photo processing envelope (just large enough to hold prints up to 5 x 7 inches in size) out of the camera shop. When Illya opens the envelope back at U.N.C.L.E. headquarters it is now a larger envelope containing 8 x 10 prints.
When Napoleon is hiding round the corner in the Thrush facility 2 men in blue suits run up but a second later there are 4 men standing around the unconscious two.
In the fight sequence at the beginning in the stationary store, several full screen shots are out of focus.
When the mannequin topples onto Illya, he slides across the floor well past the couch. In the next shot when Napoleon helps him up, Illya is lying in front of the couch.