Mistakes about computers bother me to no end, though frankly more in movies and TV shows than in books.
I think it also depends on how easy it would have been for the author to find that piece of information via google. Spain is a monarchy, so they don't have a president, and in the European country where I grew up, that is common knowledge to anyone who has made it through third grade. A mistake about a minor detail in a narrowly specialized field, especially a detail that doesn't impact the plot, doesn't bother me that much.
And then we have the book I read last year, where a character was described as being immune to being tazed, because he wasn't able to feel pain. Obviously no one told the author that the reason a tazer paralyses is because it messes up the nerve impulses in the body (they are aslo electricity), not because of the pain. A major part of the plot hinged around this guy ignoring a tazer, so that bothered me a lot more.
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