SEO Site Migrations & Food Trucks: The Longest SEO Mythbusting Video Yet

In the longest SEO mythbusting video yet by Google's Martin Splitt, he invited Glenn Gabe to talk about site migrations. It is a wonderful topic and they covered a heck of a lot. One of my favorite parts was the analogy with food trucks and how they move around but yet offer the same food - should the same signals pass as the truck moves around?