Umm, there seems to be a random vertical line that probably isn't supposed to be there between the bottom-right of the jacket that Arachne is wearing and the middle of Miia's farthest left leg (pixel coordinates - X: 1340, Y: 555).



There's also a smaller and much less noticeable random dot just to the left of Papi a bit below where the blouse and dress meet (pixel coordinates - X: 2660, Y: 520).