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: 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: 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: 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.