That one's kind of on me. Here's why. I had the original Word doc. proofread THOROUGHLY. When the PDFs of the finished books were sent to me, they asked me to proofread everything and make sure it was error-free. I really just skimmed the PDFs because everything was correct in the Word docs, and if everything was correct in the Word docs, then everything was going to be correct in the PDFs. Right?
Right?
EDIT: Actually, more clarification. I described the prank completely in Volume 4. Somewhere along the way, I decided there was no reason to write about it twice, so I asked for the prank to be deleted from Volume 1. It still falls on me for not making sure that the edit was done more cleanly, but that's what happened. ¯\_(ツ)_/¯