I think I've found errors in challenge questions. It would be nice to be able to post comments on them.
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I think to keep the questions clean, and avoid spammers (I've seen the same sort of things in the MIT OpenCourseWare), Nick Mudge has created a HipChat room. Look on the forum for the link. A couple of us have already conferred on one of the questions (we also found out that it really was correclty worded)... ;)
One question I came across was confusing to me, it would have been nice to ask for clarification/see comments from other users.