Tom S.: "Also in King's "The Stand", a character has a .38 Colt Woodsman. He has a lot of non-gun mistakes too in his books, which makes me wonder if he does it on purpose to see if people notice."
He apologized to readers for some errors included in "The Green Mile" relating to radio shows which did not exist at the time of events in the book. He claimed that errors in "The Colorado Kid" (a GREAT book; King's only recent good one) relating to Starbucks and Blockbuster existing in 1980 may not have been unintentional. THIS one I actually believe, as "solving" the Colorado Kid mystery (or, arriving at the most entertaining "solution") depends precisely on discovering these two "errors" (more precisely, mistakes committed by the narrator, Vince Teague, telling that part of the story, which amounts to a deathbed confession -- he died six months after the story was related to the young reporter). King never acknowledged all the gun errors throughout his writings. Or a bunch of other errors. Long ago he stopped having his books edited, and it shows.