Stitches in his face: Unmirrored character design makes it look interesting.
Stitches in his face while leaving the city: Animation Continuity problem, or goof, or they reused the wrong Flash symbol/group while animating.
There's tons of animation/continuity errors in Foster's, the stitch one in GWH was probbaly just another of them.
I'm glad he has them either way. BATTLE WOUNDS, BROTHER. >D