Knowing too much of the subject matter ruins many films.
Guns with infinite magazines, wrong tanks/trucks/artillery/ships/aircraft/handguns,
wrong clothes, hairdo, saluting, giving/taking orders, cheating/adapting historical facts.
Characters behaving too effing stupid (don’t open the door where the monster is locked in,
make sure that the enemy you just knocked out stays knocked out, don’t leave live enemies behind your back …)
If a film is based on a book one has already read …
This leaves me with action-comedy, all other films are ruined …
