When Phelps helps the little girl up the slide there is a small potted tree in the scene. When he begins to climb the ladder to the roof, the tree has disappeared.
In the opening, as the voice on the tape finishes telling Jim the mission, there is still quite a bit of tape left on the first reel. A second or two later, the tape runs out onto the second reel.
Barney says that he is using radar to set up a zone where Kuro will be unable to hear the real sounds, only the pre-recorded sounds. Radar basically has no capability of doing this.
When Enzor disguised as Rollin opens the door to his apartment to leave, Phelps is seen tossing his cigarette to the ground. But in the next frame when Enzor is seen exiting, Phelps is seen tossing the cigarette to the ground again.
When the limousine carrying "Vitol Enzor" (who is wearing a Rollin mask) is allowed to drive across the border, the camera operator and the background are mirrored in the reflective black paint of the car - and a boom crane with a spotlight is also visible in the side window glass.