Silver labs are a lot less rare these days they are being bred a lot.
Yes it's called "Flecking" normal in all labs, shows up more in silvers because normally in yellows it fades. Not a big deal.
Re: Silver labs I find it interesting however, that in the Labrador historically Chessie's were known early crosses with the Labrador....
Re: Silver labs You might look at this site... http://www.labradorcouncil.com/lrc-position.html They really are real...