Some houses you can walk on.
Also, there's a western exit from the textile district that traps you in the rug factory.
Thanks for the reports. I'll block those areas off so Sadie can't climb the walls. It's kind of annoying because some of the textures I just need to cover up, like when there's moss or dirt on a building, so that one in the middle I just missed. The other two, they're an impassible terrain type that is nonetheless letting players pass through. But I'll block those out.
As for the Textile District, I have a change coming in 0.2.5 that should stop the issue. Instead of going to the rug factory, you'll get a dialog box.