Revealing mistake: When the Senator is being killed by Travolta in the river, we can see some shots of his assistant before his car explodes. If you watch closely just half a second before the frontal shot of the explosion, you can see in the driver's seat a dummy with a green face.
Revealing mistake: At the end of the car chase scene between the TVR and the SUVs, the last SUV crashes into a wall, explodes and flips over into a diner. During the explosion you can see a piston pushing the car over.
Revealing mistake: When Don Cheadle slams the lawyer against the wall of the interrogation room, the wall wobbles and shakes.
Answer: JT is exactly who he says he is. He leaves a body behind to fool the FBI/CIA into thinking he is dead. Jackman would have believed it too had he not seen him heading down the stairs and the surgically altered corpse. Berry was not hurt, the wire, the DEA story and her getting shot were all parts of a ploy for Jackman to trust and confide in her, making it easier for Travolta to make Jackman do what he wanted. Travolta didn't actually kill any hostages directly himself, (though he did put them in that situation, he is by no means Mr. Innocent) - had the police done what he asked, no one would have been hurt at all. So basically, he IS a good guy, but his methods are somewhat morally lacking.
Grumpy Scot