Technically no error like 404, regular updates, quality link building and also big advantages for the people getting traffic from twitter, facebook etc..
Social Media is huge for google caffeine. Even though 80% of marketing on social media sites don't work. According to studies done in Canada firms that have paid thousands on social media.
since Google Caffeine is so new, and the search results keep on changing, I doubt anyone knows exactly what is needed. Probably have to wait till the dust settle before we look into the seo matter.
I've been through all of Google's updates and it's always stressful. Like the world is ending. My only advice is good content and inbound links cannot be stressed enough. Hold on tight. Go see a movie or two until the shake up is over then get to work.