The errata are the additional fixes or changes to the specification that didn't make it in the specification or were found after the specification :)
So I heard a new version of the errata was available I wanted to see it. However, I couldn't find it. When I asked
why the errata can't be found on the ECMA website, Brendan replied
ECMA only publishes final stuff.
So if you're looking for the ECMAscript errata or erratum, here it is: http://wiki.ecmascript.org/doku.php?id=es3.1:es3.1_proposal_working_draft
Hope it helps you :)