The Moulin Ruse Affair - S1-E17
Continuity mistake: From the outside, the U.N.C.L.E. building's wall is made of red brick. But, after a large hole is knocked through it, a shot from the inside shows no red brick at all. In fact, the entire wall is now made of white cinder-block. (00:02:30)
The Moulin Ruse Affair - S1-E17
Revealing mistake: When April peeks over the rooftop, it's completely dark outside. Every time we see the inserted stock footage of the traffic down below, however, it's a filtered daytime shot. Not one of the cars has its headlights on. (00:11:40)
The Moulin Ruse Affair - S1-E17
Revealing mistake: Waverly opens a file full of papers with a small photo of April's contact clipped inside. When we see a close-up of the photo, we can also see that the page under it is part of a script treatment. Odd thing for a spy agency to keep on file. (00:18:40)