Near the beginning when Neo was at his computer searching for Morpheus, Trinity contacts him. Neo thinks it's a glitch or something, so he hits escape, then tries control x. When he does, look at the key next to the control button. You may need to use slow-mo on your VCR if you don't know where you're supposed to be looking. Anyway, the key next to the control key is completely and mysteriously white. The reason: it's a Microsoft keyboard, complete with the Windows key. They forgot to get a plain, generic keyboard when making the movie, so they just covered it with tape or painted over it.