On visiting U.N.C.L.E. HQ, Sandy wears a yellow triangle badge. All visitors usually wear green badges.
In the opening shot of the department store, Priscilla is holding the bell but her hands are at her side and the sound of a ringing bell is dubbed in. In the next closer shot, she is ringing the bell with her hand at head level.
When Waverly is playing chess with the boy at the hospital, in the long shot his fingers are tented. Then the camera cuts to a closer shot and his hands are apart and he tents his fingers. Then in the next long shot, his fingers are untented again.
Supposedly Cariago thinks that his Uncle Giuliano sent the agents. However, when he finds the bug, he says that "they never did like me."If he thought it was his uncle, not U.N.C.L.E., he would say "he never did like me."
During the final lab attack, it's clear that many of the A-77s, which supposedly have Muriel's face, are wearing very fake plastic masks to make them look vaguely like the actress.