#7: Back-to-back translation
Honestly, what I find most baffling in this instance is not the mistake but the fact that one package bears the correct iteration while the other doesn’t. Surely, this isn’t the kind of error that can be traced to a manufacturing problem, so how does it happen?

provided by constative.com
One sandpaper packet features genuine text translated into Spanish, while the other one contains what appears to be the copywriter’s instructions, indicating that the error is human and not technical. My detective skills led me to conclude that the crime was perpetrated by someone laughing.