Damage on the left side of the Jaguar's windshield appears and disappears between shots. Likewise, the security car shows damage including bullet holes in the windshield, damage to the front left corner, broken headlights - all of which is absent moments later.
When the prison guard helps the prisoner escape, Franklin & John Doe are handcuffed together. In the next scene when John Doe hugs the prison guard, Franklin is no longer cuffed to John Doe. The scene after when John Doe grabs Franklin's arm, they are once again cuffed together.
Franklin purports to be Vic Damone Jr when meeting Guy. Guy deduces he's from Damone's marriage to Diahann Carroll. Damone married Carroll in 1987. If they had had any children, the oldest would have been 9 years old and Guy, who claimed to know Vic well would have realized Franklin was much to old to be Vic Damone Jr.
In the helicopter scene, the two French actors have all the conversation in French, except for the words "fifteen million". It would make no sense for them to say only that part in English, but that's the only way Franklin can understand that part of the conversation.
The scene in the Colosseum, Arron raises an AT4 (rocket launcher) to blow up the control booth, as he raises it, you can see through the tube. Obviously no rocket in the launcher. Also, AT-4s are not re-loadable, the launchers have one shot and then are discarded.
In the beginning of the movie, when the bad guy gets to the gasoline station to ask Franklin about the money he owes him, the car he drives is a big Mercedes S-Class. However, when the car is shown inside the car wash (only front bumper and headlight are visible) it's another Mercedes - a sporty SL 2 seater.