Factual errors: The night vision goggles that Bill uses are of the old infra-red variety, which require an infra-red light to illuminate the scene. That's why these kind of goggles were eventually phased out by the military, because the enemy could use their own infra-red equipment to zero in on the light and shoot it out - and/or the person holding it! Bill's use of the goggles in the basement scene is therefore impossible, as he's not holding an infra-red light of any kind, just a gun. The implication made by the the film makers is that Bill was using more modern light-enhancing night vision equipment, but again, this would not have worked in the basement. This type of equipment needs some kind of light source, moonlight or even starlight, to function. In a basement it's pitch black. The same error, with the villains wearing light enhancing goggles, was made in
Patriot Games (1992).
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