Have any Lego sets been released with errors/mistakes in the build instructions? If not, why not? I was thinking about the documentation process of a large set like the Death Star and it got me thinking; surely at some point Lego must've released a set of instructions that contained a mistake?

You know, referencing a part that wasn't in the final set, skipping an instruction step, nonsensical instruction etc.

If they have somehow managed to avoid this over the years, what processes/validations do they have in place to prevent such errors creeping into the eventual consumer sets?
My 7190 Millennium Falcon kit has a mistake where the inventory for the page doesn't include two pieces on it. So, invariably, when I'm building it I forget to include those two pieces, and they are left over until the very end, at which point I have to follow this process:


Say "Dammit"
Flip backwards through the booklet to find the page that last added those parts
Disassemble the model part-way
Add the parts back
Re-assemble the model
Say "There. NOW it's finished."
Swoosh the model a bit.


Here are the two instruction pages showing the error. On the second page you can see that the dark grey upward sloping pieces at the front are added, yet don't appear in the page's inventory list.