I love this kind of stuff, so I made a little compilation of loading zones you're not supposed to be able to reach in chapters one and two. There were a couple more I think it's possible to get to, but unfeasibly difficult for a human. I also included the terrible secret at the top of the waterfall in the inifinity hype update.
Enjoy!edit: it's worth noting, for the bounce arkum discovered (which was the first one of these tricks to be found), you can go off the top of the screen to the right too.