This was on Pollster.com a couple of days ago. He mentions more training and apparently fewer young interviewers. Rick certainly has first hand knowledge, and perhaps the training and prelims didn't vary as much as Lenski implied.
Also, on the bottom of this link Lenski describes exit polling and how it would differ if designed solely to validate election results, as opposed to providing networks with information on election night. I have a feeling that section won't go over well here so I won't paste it, but it's a quick scroll and description, for anyone interested.
http://www.pollster.com/guest_pollsters_corner/joe_lenski_interview_part_2.php"Well a lot of it has already been done. We sat down with all of the NEP members after that report came out and did a thorough review of all the recruiting and training procedures for the exit poll interviewers and we got a lot of input from all of the professionals that work at the news organizations that do their own surveys. They looked at the materials we were using. We had discussions and we came up with an improved training manual. We also prepared and filmed a training video that all interviewers are required to watch. We developed a new more rigorous training script and a quiz or evaluation at the end of that script to make sure that the interviewers understand the important facets of their job.
In addition to all that we have the input rehearsals that we have done every year, where we have two days in which we act like its Election Day. People call in with test results using the same phone numbers, the same questionnaires they will use on Election Day just to make sure they understand how the process works. So all of that has already gone into effect and I think our interviewers are much better trained this year than they were in 2004."
Another factor that came into play is that we found the error rates tended to be higher on average in precincts where there were younger interviewers, especially interviewers under the age of 25. This isn't to malign the abilities of interviewers under the age of 25, there just seems to be an interaction between older voters and younger interviewers that make older voters less likely to fill out surveys that are presented to them by younger interviewers, so we've also made a concerted effort to increase the average age of our interviewers.