I find mistakes in patterns from time to time. It's best to do what you did. Read the directions carefully, make sure the fabric amounts are correct, (as I've found the amounts of fabric required to do a pattern to be wrong in patterns and you end up with not enough fabric). And before cutting all the pieces do enough for one block and make that one block to make sure it looks right. I've done an entire quilt and when put together it didn't make the same design as the picture. (I liked mine better so that was good.). As soon as you find a mistake in a pattern I would let the writer, or company know so they can make the changes to the newer prints and send out corrections for the ones already out for sale.
I've found mistakes in the WM quilt of the month patterns and marked each pattern with the correction before we handed them out.
Phyllis
QuiltingGrannie