Plot hole: Why on earth would the military be interested in a soldier (sailor, aviator, whatever) who has to go into combat naked and unarmed, and who is detectable by an enemy equipped with a pair of cheap, mass-produced goggles? How would you treat them if they were injured? They would be utterly useless in any form of military operation, even espionage.
Plot hole: In the Redstar mainframe, we are told that the floor of the vault will trigger the alarm if it receives more than 0.25 seconds of contact (apparently even with the security checks). What would be the point of the bosses going through all of those security measures if they would just set the alarm off anyway? Surely once the girls have faked the fingerprint and retina scans, they don't then need to flip across the floor! (00:33:55)
Plot hole: Peter goes into Carl's mind to save Catherine. When he's in there he sees the tank with the water nymph. On the tank are strange symbols which provide the FBI with the clue needed to find the latest victim. Makes sense so far. But, go back to the scene just after the FBI have captured the comatose killer and are looking in his basement. The FBI are looking at the contraption that the killer uses to suspend himself over the victim. On the contraption is the same symbol seen later on the water nymph's tank. Why didn't the FBI follow up the symbol then?
Plot hole: When Alex and Clear are sitting and having coffee they are on a corner. He looks in the window to see the bus pass, and as he looks to see if it is there, it's not. As the camera pans across the street, there is some construction going on which is blocking that whole road from being used, but then Terry, Carter's girlfriend gets "waxed" by the bus - no way it could have got through all that construction.
Plot hole: When Tim Robbins is floating away in space his wife could have easily saved him. She could go out a little further, use the grappler to catch her husband, then use the fuel she has remaining to halt their acceleration towards the planet and return them partway to the necessary orbital altitude/velocity to rendezvous with the resupply module. Then, Gary Sinise could come out partway to them using his thrusters, Connie could shoot the grappler out to him, and he could reel both Connie and Tim Robbins back in to the resupply module.
Plot hole: It has already been mentioned that a certain shot reveals that Sidney isn't wearing the bullet-proof vest when she should be. Further to this, most of the shots in the climax sequence make it impossible for her to be wearing one, as you can see the contours of her chest throughout. A bullet-proof vest would flatten the appearance of this.
Plot hole: In the first night that Nyah is in Ambrose's house she meets with Ethan outside the house and they talk for about 1 1/2 min. Then we find out "Ethan" was really Ambrose with one of those "high-tech" masks. My question...After being in bed with both, how come Nyah didn't recognise Ambrose is about 5 inches taller than Ethan?
Plot hole: Referring to that blackout night. How come the group can actually film how they put all their cameras and stuff into its hide?
Plot hole: Towards the end of the movie when Michael Douglas makes his speech at the White House, he is able to quietly walk out of the gates with no reporters anywhere trying to chase him down. Totally unrealistic (especially considering what had just happened). (00:03:03 - 02:13:40)
Plot hole: After Nanahara and Noriko run away from Akamatsu at the school, Niida shows up from behind some bushes opposite the school and inadvertently kills Akamatsu with his crossbow. But Niida is Boy 16, which means he should still be in the school building (he's supposed to come out after Noriko, who's Girl 15). There's no way he has any time to get into those bushes.
Plot hole: How did Carolyn Fry get out of the cave in the canyon to confront Riddick at the Skiff? Riddick strained to roll the rock into the cave entrance, and he was a big, strong man from a position of good leverage. How did Carolyn and the other two push the rock out of the way so that Carolyn could get out? And, then, how did Carolyn mange to push the rock back into place? It was still there when she and Riddick came back from the Skiff to bring back the other two.
Plot hole: The attack on Israel scene leaves one important question: How would it have been possible for the bad guys (the Russians, or Arabs, or whoever) to stage such a massive surprise attack without being discovered ahead of time? Anyone who is knowledgeable in modern warfare would know that an operation of that scope would require a considerable amount of logistical preparation that could not possibly go unnoticed, especially considering the capabilities of modern spy satellites.
Plot hole: In the cafe scene after the fingerprints have been identified as belonging to someone who was thought to have been killed, Jean Reno tells Vincent Cassel that the person who shot at him had all ten fingers. How did he know that? The audience only sees one hand which is holding the pistol and the other hand is out of sight.
Plot hole: In the several scenes at the hotel when Carlo and Bonehead confront Jack there are a total of 9 shots fired in the hallway and another 30 ultimately fired in the room as well as a chair thrown through a window. Although we were able to hear a baby crying in another room when Jack initially climbed the stairs no one seems to hear the monumental confrontation for a very long time or look outside their rooms to see Bonehead lying dead in the hallway. Carlo has an enormous amount of time to patiently question Jack and make phone calls. When sirens do arise after a long while, the very first responders are the Feds screeching up in their big red Caprice followed by some police. Somehow the US Treasury Department is able to get to the scene faster than the police.
Plot hole: After the marines fire into the crowd and things die down, Jackson tells his men to stay down because of possible snipers. Yet he is standing upright the whole time. Not the best tactical move. One sniper and the mission loses its commanding officer.
Plot hole: When Rudy removes the leg of the bed to escape from the motel room, he finds Charlize Theron and Gary Sinise in the pool. He walks away saying something to the effect of "I am out of here." As he trys to escape, he keeps running into the other members of the gang and has to rush back and pretend he is still handcuffed to the bed when they check on him. If he is already free of the bed, why doesn't he leave after the gang goes to sleep for the night?
Plot hole: Towards the end we see Jones ring Derrick to warn him that Travis has a gun - why would she do this if it's all planned? why risk him picking the phone up? he would have escaped before Travis had time to stop him and get him back inside to finish the set up. This scene is purely for the audience to be more taken in and shocked at the actually twist. (01:17:00)
Plot hole: The scene where the sisters are talking about killing the popular girl in class during P.E. during a game of Lacrosse, Bridgette is pushed into the body of a disemboweled dog. Everyone then starts to freak out seeing the dead animal. How could anyone, the students, teachers, grounds-keeper, not see that corpse until Bridgette was knocked into it?
Plot hole: After witnessing two friends getting killed by massive shark bites (as well as Richard's shark encounter) they all choose to swim away from the island together; even though Sal and Richard used a boat to get the mainland carrying multiples bags of supplies. The newcomers also arrived with multiple kayaks which Richard was aware of before seeing them all get shot.
Suggested correction: Presumably the military are interested because Sebastian's research could lead to advanced forms of invisibility technology, such as the ability to turn materials and weapons invisible for use in combat.
You cannot second guess the film like that. Sebastian is making no effort to make non-living items invisible and throughout the film we see that is not possible (why else would Sebastian have to walk about naked?). His research is on animals (and later humans) not "materials and weapons" and is based on their physiology, anatomy and metabolism. How would you inject a rifle or a tank with a serum? They don't have a bloodstream. The military wouldn't see any value at all in this research - maybe they would be interested in invisibility, but not if it was restricted to living creatures as we see here.
You know how easy it would be for an invisible person to infiltrate an enemy's compound undetected and take out powerful leaders or dictators? Especially if no-one knew the technology existed.
Easy? Impossible. First, they would be naked and unarmed. Too bad if you are trying to knock off Vladimir Putin - a taekwondo black belt - with your bare hands during a Moscow winter! Being invisible doesn't mean you can avoid making a sound or triggering a pressure plate or an infrared detector and so on and so on. Final answer - a naked, unarmed combatant would be about as useful as a chocolate teapot in any form of operation, covert or otherwise.