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: 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: 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: 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: 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.