You would be shocked at the number of errors in quilt magazines and books. Since the internet, I look to see if the book/magazine has posted corrections on line. After working on a quilt for weeks, got to last step, discovered there was an error. Looked for disclaimer on book, usually on first page, there was no disclaimer. Called publisher, explained problem, received a check for cost of fabric and some of my time. Now always check for errors, especially if the material cost is higher than normal.