Corrected entry: An electromagnet is used to pull a metal lever on the other side of a metal door. The metal door would shield the lever, making this impossible.
Corrected entry: It is the height of insanity that the underground laboratory does not have an emergency exit; even a top secret government facility would have one. This lab handles highly inflammable and explosive substances and would have a clear and well rehearsed evacuation procedure. Having said that, at the end of the film the survivors of Sebastian's rampage simply open the roof hatch of the lift and climb the ladder that is on one side of the lift shaft. Why didn't they all do that in the first place? Beats getting killed by an invisible, overacting psychotic.
Corrected entry: The serum is supposed to "quantum shift" the body of the subject out of range for visible light. However, Bacon is seen working in front of his computer modelling molecules. Clearly, a "quantum shift" would have nothing to do with molecular bio-chemistry, but rather, say, high energy physics. (Something closer to old films in which scientist would try to "beam" someone into invisibility).
Corrected entry: Throughout the film, Kevin Bacon's character is seen with sticky sensor wires stuck to the top of his head and around his face. But we never see him get his hair cut off, even though we even see he has no hair when they first attempt to make him visible. Also, just a short time later, we see Kevin swimming in a pool, with a full head of hair, and later it is gone again.
Corrected entry: Sebastian can see perfectly like anyone else but because he's invisible light would hit his retinas from all directions making him effectively blind.
Corrected entry: There is a scene where the invisible Sebastian rolls over on his 'bed' and pulls the sheet over. The next shot is from the opposite direction where you can see the monitor showing the thermo image of Sebastian - in the monitor we see Sebastian rolling over and pulling the sheet again. Real time would not afford enough time to be doing this twice.
Corrected entry: The way Sue is wrapping the wires around the door handle in order to make a magnet, would cause the current to go from left to right and return from right to left. This would create two equally powerful magnetic fields in opposite directions so the final sum would be zero magnetic field. The door handle shouldn't get magnetized.
Corrected entry: When locked in the freezer, why didn't Linda simply yank out a few of the obvious hanging wires behind the refrigeration unit?
Corrected entry: The pressurized tanks of flammable liquid that Linda uses to make a flamethrower are sitting unsecured in the lab. OSHA regulations require pressurized cylinders to be secured to prevent them from tipping over. The danger is that the top will get knocked off, and the tank will shoot around like a rocket. Any lab would have their tanks secured for this reason.
Corrected entry: When Sebastian comes in at the beginning there is a guard outside who waves at him. When he tells the guy watching him from heaven he is leaving there is a guard out there again. Yet when Sebastian cuts the lines and changes the elevator codes and is killing everyone and all the explosions, screams, shouting, and noise going on he didn't hear anything or call anyone. He should have at least heard a faint explosion or shout.
Corrected entry: The must be a lot of dumb scientists in Sebastian's lab. While defibrillating the invisible gorilla, (s)he becomes completely visible for a moment. However, not once do the scientists consider that applying a mild electrical shock to the system renders the invisible animal visible again - that electricity may be the key to the whole invisibility problem. They don't even comment upon the fact that the gorilla does become visible.
Corrected entry: 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.
Corrected entry: When we see Sebastian's saucy neighbour for the first time, she has blinds on the window, but when Sebastian is invisible and he looks at her again, she has curtains.
Corrected entry: When the guy is lying in the corridor bleeding and Sarah (the veterinarian) says he needs blood, she goes back to the lab and starts pulling out bags and bags of whole blood. Problem: They're not authorized to work on humans, so the blood she's planning on pumping into this poor soul (without checking his blood type), is from either a gorilla or a dog.
Corrected entry: In spite of having all kinds of sophisticated scientific and video equipment in the lab, Sebastian shows the Generals the gorilla experiment using an old fashioned movie projector...
Corrected entry: When Elizabeth and her boyfriend notice the nitro in the mixer machine and she wanted to take the top off but her boyfriend said, "No, we gotta go", why didn't they just unplug the machine?
Corrected entry: Kevin Bacon is supposed to be completely invisible, however we see him eating food while he is invisible. The food he is eating is something that can be seen. So once the food went down into his stomach wouldn't the other characters of the movie see digested food floating in mid air every time he walked by?
Corrected entry: After Sebastian turns invisible, the first thing he complains about is the lights being too bright. The team explains it away by pointing out that his eyelids are transparent, so his eyes are now extremely sensitive to light. However, over the next few scenes, the lights are as bright as before. When Sebastian is complaining to Elisabeth Shue about his condition, he reaches over and turns on a lamp. His face and eyes are pointed directly at the lamp, but it no longer affects him.
Corrected entry: In the beginning of the film, when the invisible gorilla has escaped, as Dr. Caine is getting the tranquilliser guns from the cabinet, he bets Matt that he can get the gorilla first. He does shoot the gorilla first, with the aid of infrared goggles. The problem is, we blatantly see him close the goggle/tranquilliser gun cabinet before he ever gets a pair of goggles... In fact, as he runs down the hall we see both of his hands and all he is carrying is a tranquilliser gun.
Corrected entry: They don't even need to inject anything to return Kevin Bacon to normal, all they need is to shock the hell out of him. If you notice the gorilla when they use the paddles on her she becomes visible. Also at the end of the movie Kevin Bacon is made partially visible after he was electrocuted. A few more shocks and he would have been fine.
Corrected entry: Before Sebastian tries to escape, he makes nitro-glycerine, but the way he uses isn't real. He mixes sulphuric acid with other compounds, but the REAL way is mixing sulphuric and nitric acids with glycerine on a ice bath (because Nitro-glycerine detonates at 30 ºC in presence of nitric acid), and the extracting the nitro-glycerine from the acid. Nitro-glycerine is clear-orange, but there has a strange brown colour.