lucy24 - 9:52 pm on Nov 9, 2012 (gmt 0)
Oops, backtrack. I think some of us assumed that the 404s on the new site are the end of a two-step process: blanket 301 from old to new, leading to 404 on the new.
Are the 404s from people coming to the new site "cold"? Apart from domain name, are they the same URLs that are/were getting 404s on the old site?
Most important: Are you getting human 404s, or do they come strictly from the googlebot? If it's only google, you can just ignore them. Mark them "fixed" and carry on.