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Thank you, Marcus, that helped a great deal!

They both show the correct URL, so I'll disregard those errors

Experienced backend dev, but SEO newbie here

When SEOmoz crawls my site, I get notified of DPC errors on some list/archive sorted pages (appending ?sort=X to the url).

The pages all have rel=canonical to the archive home.

Some of the pages are shorter (have only one or two entries).

Is there a way to resolve this error?  Perhaps add rel=nofollow to the sorting menu? Or perhaps find a method that utilizes a non-link navigation method to sort / switch sorted pages?

No issues with duplicate content are showing up on google webmaster tools.

Thanks for your help!