It is beautiful. Love the colors.One little mistake in all that piecing is acceptable.
The pattern has so much movement that it is really hard to tell. I looked and looked at the quilt before I saw it., and probably would not have noticed it if you had not said there was a mistake in it.
I once made a quilt like a bargello and left out one of the strips. When I started to put the section together I noticed it and had to rip a whole section apart and add one piece to all the rows.