I found out that you can exit most missions early. When the "Mission Complete" Text Shows up you can go to the Menu and hit "Return to map. With that you don't get the ending screen and you skip the Campsite. It's similar to what we do at the Password Computers. Just wanted to share since I don't know if it is known.

Another minor thing is that, with Meg, you can Grapple past these Stone walls from underneath (But I didn't fully test it yet)

Thanks for finding this, I will add it to the guide on google docs, furthermore, could you please elaborate on "these" stone walls? It might be obvious, but I don't know what you're talking about here.

oh yea... here's a pic of them I didn't really mess with it but you can grapple past them from the bottom, idk if from the top works too.