Visible crew/equipment: When Sebastian is stalking his neighbor and looking at her to see if he can see her undress in the beginning, there is a brief moment where you can see the reflection of a camera crew in the window looking into Sebastian's apartment.
Hollow Man (2000)
1 visible crew/equipment mistake - chronological order
Directed by: Paul Verhoeven
Starring: Kevin Bacon, Josh Brolin, Elisabeth Shue, Rhona Mitra, Kim Dickens
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.
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: The infamous scene where Sebastian kills a dog was thoroughly investigated by the ASPCA - a non-profit animal welfare advocacy group. They reportedly felt the scene (despite being only shown in heat-vision footage) was so graphic, they suspected it might have been real. Director Paul Verhoeven ended up having to demonstrate how the scene was accomplished - star Kevin Bacon picks up a real dog, but through some slight trickery, was able to quickly switch it out with a realistic fake dog filled with stage-blood when he goes out of frame for about a second.
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.