To be honest, I don't quite follow your argument. I quite assure you it is easier to print all of the same thing than a whole variety of things. On the TAZ machines there, which was what made up the large majority of the machines in the video, we printed about 22 different parts. You can see the parts list here:
LulzBot TAZ 3D Printer Parts Printed on a LulzBot TAZ 3D Printer Source Code
We did consider printing all the same thing yesterday, but we didn't want to halt production of actual parts because we figured it didn't matter, and it would interrupt the schedule. We're doing this weekdays during business hours. But if Guiness says it all has to be the same, then we'll just do that--that won't be a problem.
Thanks for your consideration,
-Jeff