It's inevitable: Mistakes get into print. (Also into blogs, but that's a whole nother ... I mean, that's another story.)
I confessed here some time ago that I read over the phrase "marshal law" (instead of "martial"), which got into my editor-in-chief's column. And that was bad. Very, very bad.
But it's hard not to gloat when the phrase "spinal chord injury" turns up in The New York Times--and, two days later, it remains in the online version, in the third paragraph.