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Part of me thinks this is just because so many live pages still have links to these URLs, and while Google knows they 301, some part of its index maintains the old URLs due to the strength of their presence in the link graph. It might be a technical limitation too, where Google uses synthetic links/URLs in their indices to represent redirected stuff. In any case, not a big concern for Moz, and shouldn't be for you either if you're redirecting a site. So long as the traffic to the pages from search goes back up and indexation looks solid, you should be fine.

Google is officially supporting some emoticons. I talked to one big-brand SEO last week who has tested it with a fair degree of success. A couple of warnings: (1) Testing the impact on one title tag is a fair amount of work, so it really has to be a high-impact SERP. This isn't something you want to spend days on across thousands of results. (2) Make sure the character/symbol really is relevant. People focus on the first two words of a headline, and that emoticon may well take the place of one of those words, so make it count. I wouldn't do this just because you can. (3) Not all characters render properly on all OSs and devices. Make sure to test.