What always strikes me is how uniform the appearance of screens is in SF films. When I look at my own screens, I see various applications that have all made different choices, within the bounds imposed by the GUI itself. An old app doesn't magically get new design styles. Old Windows XP apps, for example, may look odd when run on a Windows 7 system. Apparently, in the future, not only is everything blue, but the platforms they use have very rigid design rules that are strictly enforced.