That reminds me that I was disappointed at that final scene. It made the wall look about 20-30 feet wide at the most. If I were just a show watcher, I'd wonder why they didn't just burrow through the thing. But in the book that thing was fucking massively wide. I wonder if maybe it's just going to be a thing where the bottom is wide, but the top significantly less so. That's the only way to makes sense where a gigantic chunk of the wall falls off and it doesn't collapse the whole thing. And unless they scrap the whole wildling battle inside the wall, it won't make sense unless that's the case.
I also feel like Ros was a LOST type "mistake." It looked like they decided to dramatically enhance a character who wasn't really anything but a background character in the books. So you think, hey, maybe they've got something special planned for her. But she basically gets tossed aside in a rather boring way. Granted, that's not really out of character for GRRM, but it still makes me wonder what the whole point of making her so much more important was.