In 2006, my Toa Nuparu set came with the wrong axle—a regular 5 axle instead of a 5.5 axle with a stop—and a clarification/apology poster:
The thing is, I can't seem to actually find my copy of it; all I have is this scan I made shorty after buying the set. BrickLink doesn't seem to have an entry for any such item. Has anyone else ever come across this?