Media firms can be tricky too, because in our modern world much of our social interaction takes place online. If you go for accuracy there's a good chance your date film will date in a very different way, so for example You've Got Mail's love affair with AOL seems rather odd today, and we're sure anything with Facebook in it - The Social Network aside - is going to seem equally odd a decade or so from now.
As not seen in: Blade Runner
With the honourable exception of
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So, for example, in Blade Runner, the future's favourite communications system was a public videophone rather than a cellphone. Blade Runner did go on to inspire real-life phones, though: Google's Nexus One takes its name from the androids in the film.
The lack of cell phones in films already seems odd: as The Guardian's Joe Queenan writes, the rise of the smartphone means that "plotlines that were completely plausible as recent as 10 years ago are no longer plausible now" [http://www.guardian.co.uk/film/2011/jul/28/technology-killed-film-plots-hollywood].
Really awesome numbers
As seen in: Johnny Mnemonic
It was pretty cheesy back in 1995, but these days the Keanu-starring, William Gibson-adapting Johnny Mnemonic is even funnier - particularly the scene where he doubles his on-board storage capacity from 80GB to a whopping 160GB.
Like Dr Evil's "One... million... dollars!" in the Austin Powers movies, Keanu's numbers haven't kept up with inflation: 80GB may have been a mind-boggling amount of data in the mid-1990s, but these days it's a couple of flash memory chips.
As seen in: The Matrix Reloaded, The Mummy Returns, Die Another Day, Spider-Man...
As CGI gets better, our tolerance for bad CGI diminishes - so if you watch something like the Matrix Reloaded's famous Burly Brawl ten years on, it's rather like watching someone playing a recent Xbox game.
There's no shortage of examples: the stampeding dinosaurs in King Kong, the Scorpion King in The Mummy Returns, the surfing scene in Die Another Day, the Green Goblin in Spider-Man... the list goes on and on and on.