Plot hole: Why on earth would the military be interested in a soldier (pilot, sailor, marine, 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.
Hollow Man (2000)
Plot summary
Directed by: Paul Verhoeven
Starring: Kevin Bacon, Josh Brolin, Elisabeth Shue, Rhona Mitra, Kim Dickens
A scientist invents an invisible formula and tests it on himself. However, the formula's effects become permanent and after enjoying such freedom, he goes mad and tries to kill the rest of the science team that worked with him.
More mistakes in Hollow Man
Sebastian: I can't take much more testing.
Matt: I know how hard it is.
Sebastian: Bullshit. You don't know anything.
Matt: This isn't easy for any of us.
Sebastian: Fuck you, Matt! It is easy for you. I was to be in phase-shift for three days. It's been ten fucking days, all right? Ten days of tissue tests, radiation tests and your fucking needles! I can't fucking take it anymore.
Matt: What I meant was.
Sebastian: Fuck what you meant! And don't ever... Don't ever tell me how hard you have it.
Trivia: Whenever Sebastian is invisible and interacting with the other characters, Kevin Bacon's voice would be broadcast throughout several speakers randomly hidden throughout the set. This was done to make the reaction more genuine, since the actors would honestly not know where his voice was going to come from next, just as the characters would not know where Sebastian was.
Question: What is the song playing when Kevin Bacon is driving his car?
Answer: The name of song is "Power Struggle" by Sunna.
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.
When you are invisible, your eyes are too. So the sunlight goes right through them. To be able to see, the sunlight must reflect at the back of your eyes. That means the soldiers would be invisible but blind.
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.