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'Links to your Site' feature shows who is linking and how they are linking to your site. 'How is your data is linked' gives an overview on anchor text distribution within your link profile from both types of links.  You can see a basic overview here.

Chances are, you'll rely on a Open Site Explorer to get a better, more in-depth overview on how your anchor text breakdown looks.

Wouldn't you be showing 404's instead of 500's in the first place?

If the old URL's are still showing in the index, I'd reckon you'd want those 301'd to relevant pages anyways, at worst, at least a resource-heavy 404 page popping up rather than a 500.

External links in and linking C-blocks are playing in their favor. Both are still an important metric to look at.

What keyword is this for?