Barney attaches a phone line to the phony utility van, but later when the van drives away, the line is gone.
When Willie alters the lettering on the maintenance truck, he only does so on the driver's side. When he drives up to the embassy, the lettering is also changed on the passenger side.
The photocells that guard the entry into the vault are shown as a set of lights on each side of the doorway. Technically, there should be a set of lights on one doorpost and a set of photocells on the opposite doorpost.
Willie needs to replace a large section of the duct to allow Tina to get into the building, but the section he claims is "shot" is clean with no blockage.
When Brazneck opens and then closes the vault the first time, he turns the handle counterclockwise both to unlock and then relock the vault door. Later, when Tina opens the vault door, she turns the handle counterclockwise, but when she relocks the vault she turns the handle clockwise.
When Braznek closes the safe after retrieving the coded message he spins the large handle counterclockwise to lock the vault. When Tina Mara locks the safe after stealing the message, she spins it clockwise to lock the vault ... which would be correct.
The dial on the safe that the characters turn for the combination has no numbers on it or around it.
At the Soviet Embassy, the Swiss flag is flying.
Willie changes the name of "his business" on the maintenance truck in public.
Tina talks to Barney via the headset while she is at an air vent which services the room where Rollin and Brazneck are, where she can be heard by Brazneck "thanks" to the echo produced by the air ducts.