Even when desktop systems became more common, filmmakers continued to ignore the realities of computing. Need I even mention the classic "virus uploaded from a Mac to an alien spacecraft" scenario in Independence Day?
Nowadays, when every screenplay is tapped out on a Mac or a PC, there are less obvious errors -- but there is a mythos that has been built up that most movie makers follow. For example, sometimes it feels as though everyone in movies is still using AOL or a similar kindergarten-level e-mail program that pops up a cheery, large-type box announcing, "You've got mail!" Another is the guy with the long hair, glasses, and no sense of style, who will always out-geek any onscreen computer pros who look like they might actually pull in a salary. And when I see Our Hero madly typing on a keyboard for several minutes without once having to pause to see what the heck is actually happening on the computer screen -- like whether there may be an error or two in all that new code -- I tend to snicker a bit.
But hey! It's the movies, after all. And in the end, no hunt for computer-related bloopers is as much fun as catching which tech vendor's logo has been placed in careful view so that we know which system the good guys are using to save the day.