The agents working for Agent Cane downloaded Vaughn's files from the US DMV. At a far off shot, you can see on the screen of their laptop is a picture of Vaughn's driver's license. But then, on the next close up shot, you only see a large picture of Vaughn. They then search through the DMV database to find Vaughn's license. Then you see the same picture as was on the screen before they looked it up.
When Sydney and Dixon travel to Nice, the landscape actually shows St.Tropez, recognizable by the yellow/red church.
During the post-cinema car chase, Sydney is told that she is being tailed by one vehicle behind her and one vehicle a block over, paralleling her course, but the accompanying map shows both enemy vehicles behind Sydney on the same road, not separated.