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It's hard to say, now that google only shows random backlinks. You might check yahoo backlinks, that could at least put you on the track of some possibilities.
My guess is that it's something that occasionally happens with PR when dmoz is involved. Sometimes google somehow decides that a domain is linked from a high pr cat, usually mainstream, and so you get a short period of falso pr.
You know, I don't know if dropping the url into a PR checker might give you it's more realistic pr...
But, if you think it's an error, it probably is.
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