Luckily we can order proofs.
I made the error to upload a first edit, instead of my final version.
And a little image correcting on the cover is an option, a thin line of the back bleeds onto the spine and a thin line of the spine bleeds into the front image. It's hardly noticeable and if it is not pointed out, you probably wouldn't even notice. 
Apparently I have no now pointed it out to everyone, so yeah, correcting it, is definitely an option.