From Simply Statistics, a link titled We used, you know, that statistics thingy, which in the original read: We really don’t care what statistical method you used, all of which pointed to an abstract in BMC Systems Biology 2011, 5(Suppl 3):S4 that contains:
(insert statistical method here)
It happens. Even with proof reading by authors, copy editors, publishers.
But proof reading reduces the error rate greatly.