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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?

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I think the instructions get tested quite thoroughly. My two boys are scheduled to do a focus group on Another Manufacturer's Product quite soon, and one of the screening questions asked whether they were – Will E. May 16 '12 at 19:42
@WillE. asked whether they were... what? – nhinkle May 30 '12 at 3:25
I saw this picture on failblog.org. There is a high likelihood that it has been photoshopped but maybe someone can identify the instruction sheet it is from and verify if it is fake or genuine. – mcqwerty Jun 29 '12 at 18:24
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@mcqwerty - It's real, you can find it on page 62 in book 2 of the instructions (pdf) of the set 8038 - Battle of Endor. (And that was fun to search, thanks for the challenge!) – Joubarc Jul 4 '12 at 7:14
@Joubarc - Wow! Great detective skills :-) – mcqwerty Jul 4 '12 at 15:59

5 Answers

LEGO have made mistakes several times in the past and will continue to do so, (as is the norm for a toy manufacturer of it's scale.)

I can only speculate that the best way to ensure instructions are correct would be to build the model. Following the instruction as you build you're able to pick up more than just missed steps.

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I'm fairly confident they do so at some stage in the process and, but even that doesn't seem to ensure all errors are eradicated. However, it sometimes can lead to errata sheets being added to the box when reprinting the instructions fully isn't an option anymore. – Joubarc Feb 27 at 15:46

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:

  1. Say "Dammit"
  2. Flip backwards through the booklet to find the page that last added those parts
  3. Disassemble the model part-way
  4. Add the parts back
  5. Re-assemble the model
  6. Say "There. NOW it's finished."
  7. Swoosh the model a bit.
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Mistakes do slip through from time to time, and are actually not so uncommon.

Most of this is hearsay, but as far as I understand the persons in charge of doing the instructions are not the designers themselves. Similarly, there is certainly a Q&A process which aims to ensure the model is as faultless as possible, including the instructions. Building it is most certainly a part of the process.

But error do creep through, and sometimes are only discovered even after instructions are already printed. In these cases, it's not uncommon for LEGO to add an errata sheet to the model rather than reprint the full instruction book. See here for an example on LEGO wikia.

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The parts list page for the Ultimate Collector Edition Millenium Falcon (10179) contain 5 mystery pieces that aren't included in the set, and aren't used in the build.

See What is piece 4211642 from 10179 - UCE Millenium Falcon?

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If I remember on the LEGO website a few years ago there was an incident with their Batman Tumbler? They had to reissue new instructions as they left something out? It was a long time ago and I didn't buy the set. I also noticed on the death star mini figure set (forgot the number - sorry) but on the instructions with the emperor's room I got some of the pieces wrong because the colour on the instructions was so bad I couldn't make out what colour they were supposed to be. Alas, when I almost finished it I found my error and back tracked taking the whole thing apart...

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