The errata list is a list of errors and their corrections that were found
after the T-Shirt was printed. Errors that were corrected in later printings
are also listed here, separated by the printing date.
To find the printing date of your T-shirt, try to remember when you bought it.
Printings that are not listed here contained no significant corrections.
The good people at Copyleft have put a better picture of a guillotine on
the design. It's better than the one I found.