This has happened even with contract-linked editing of information sources, such as the old encyclopedias.

As a philosophy, managing information the wikipedia way has many things to offer, but omniscience isn't one of them. Actually, perfection can only be a goal, not a promise. The good thing (some comfort, if not a genuine solution) is that the current resource can be instantly corrected when such unhappy things come to light.

A problem will remain with the offline distributed copies that many of us think are essential to bolster information empowerment in the lesser digital world. But even that is not analogous to the sheer waste of millions of copies of paper editions, and the likelihood that many, if not most, never got corrected (appended) and still hang about spreading misinformation.

--
Vickram
Fool On The Hill
"The cameras were all around. We've got you taped; you're in the play. 
Here's your I.D. (Ideal for identifying one and all.) 
Invest your life in the memory bank; ours the interest and we thank you."
Jethro Tull: A Passion Play (1973)