In my review queue, I have been seeing a lot of questions and comments put as answers. How can we make it clear were these things should go?
I don't think there's a good way to do it. All we can really do to prevent "mis-posting" is expose new members to instructions telling them what should and shouldn't be posted as an answer, but most of them aren't going to read instructions. I think the best we can do in practice is stay on top of the moderation: watch out for non-answers in the queues and while browsing questions, and flag them as such.