Corrected entry: When Knives is in the bathroom dying her hair blue, she puts the dye on the right side of her head (from your point of view). Then when she's looking in the mirror, she turns around and suddenly its on the left side. From then on in the movie though, its back to the right side of her head.
sweavers
21st Feb 2011
Correction: When she dyes her hair it's on her left side. When she is facing the mirror... from her perspective it's still on her left side. When she turns around it's still on her left side.