Corrected entry: Nicholas Cage's eyes are green originally, and John Travolta's are blue. After the operation/conversion of the two characters, the eyes did not change, and they should have. After the operation, Nicholas Cage's eyes should be blue and John Travolta's green. The eyes should have been switched, and it is clear that they aren't wearing any lenses, because of course if they had been wearing lenses then Castor-as-Archer would have removed them. There is also no sign of any "eye color changing" during the operation.
Corrected entry: Troy is being kept alive by life support machines. In the operating theatre the machines are gone so shouldn't he be dead? And if he recovered enough to not be on the machines why did they go ahead with their plan?
Corrected entry: The secret supermax high security prison, the bad guys brother is allowed to leave why? just on the say so of an FBI agent. For a facility like this to remain secret, a prisoner would have to remain for life. NO-ONE would or could EVER be released for any reason, its very existence was as much a secret as its location. In effect they would be dead to the outside world.
Corrected entry: When Castor is in John Travolta's body, he goes "home" and makes a romantic dinner for his wife - the camera pans across the table, laden with a lot of things (spaghetti and meatballs, two lobsters). The wife is thrilled. Later on, when Nicolas Cage (John Travolta) is in a scene with the wife at the hospital, trying to convince her that he is her husband inside, he tells a touching story about their first date and how he took her out for surf and turf and didn't know she was a vegetarian, and she only ate bread, and she broke her tooth. Blah, blah, blah - it was very touching. Wouldn't the wife have noticed something was wrong if her "husband" made her a meal featuring lobsters and meatballs?
Corrected entry: How come Archer's wife doesn't notice the switch when she's intimate with her "husband"? I'm pretty sure she would have noticed if his kisses, birthmarks etc. and most of all the private parts would be different, which it's safe to say they are, as at no point of the movie is it noted that the doctors switched anything besides their faces. The doctors didn't implant parts from Archer to Troy, as there was no reason to do this.
Corrected entry: A person's facial appearance is based on the precise shape of their head which is based primarily on their bone structure. Cage and Travolta have noticeably different shaped heads. Simply removing a person's skin from his face and planting on another person's skin in its place would absolutely not change their facial structure in the least bit.