I was under the impression it was just sloppy coding again, but I dunno. Everything rendered atm isn't rendered as an effect or anything wonky like that, so it may be an artifact left over from a previous version. I also sorta have this memory of making a title screen with the moving clouds bg, but I can't remember if it was pre-equipped to handle that or whether I had to do some more hacking.
tl;dr I'd say don't worry about it. Aside from it being interesting, I can't think of any reason why you should study it.