* AwesomeDearBoy: Creator/KevinBacon wanted the part ''so'' bad, because he really wanted to play the Invisible Man (and all the attendant moral complications) and be part of the cool effects for invisibility that the advent of CGI would allow.
* CreatorBacklash: Creator/PaulVerhoeven has admitted that he doesn't really like the film, reportedly due to the idea behind it not being at all idiosyncratic. This contributed to the movie being his latest American production...in 16 years. In 2013, Verhoeven said this to ''The Hollywood Reporter'':
-->"I decided after ''Hollow Man'', this is a movie, the first movie that I made that I thought I should not have made. It made money and this and that, but it really is not me anymore. I think many other people could have done that. I don't think many people could have made ''[[Film/RoboCop1987 RoboCop]]'' that way, or either ''Film/StarshipTroopers''. But ''Hollow Man'', I thought there might have been 20 directors in Hollywood who could have done that. I felt depressed with myself after 2002."
* DyeingForYourArt: Creator/KevinBacon said it was his most difficult role ever given the uncomfortable getups he wore that would allow the effects artists to erase him in post-production, including [[https://editorial01.shutterstock.com/wm-preview-1500/5883134e/d88e2a2f/Shutterstock_5883134e.jpg suits, colored lenses and make-up]] that would at times cover his hair and teeth. And that's not counting the suffocating and smelly latex mask used to make his character 'visible' for others.
* EnforcedMethodActing: To get the right reaction from the cast, Creator/PaulVerhoeven had speakers put in different places on the set, and had Creator/KevinBacon's voice come from different speakers so the cast would genuinely react to the invisible character moving around. For the scene with the invisible gorilla, Paul screamed to the microphone, imitating gorilla noises.
* IronyAsSheIsCast: Creator/KevinBacon [[Film/FridayThe13th1980 had played a victim in another]] SlasherMovie, now in this slasher film, he's the slasher himself.
* SimilarlyNamedWorks: The producers had to purchase the rights for the unrelated novel ''[[https://en.wikipedia.org/wiki/The_Hollow_Man_(Simmons_novel) The Hollow Man]]'' to use the title.
* WhatCouldHaveBeen:
** Creator/EdwardNorton and Creator/GuyPearce were considered for Sebastian.
** Creator/RobertDowneyJr was considered for Matthew Kensington.
** Music/JenniferLopez was offered the role of Linda [=McKay=].
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