Being successful with agile requires tackling three parts: the process itself, building strong teams, and using better technical practices. Yet, most organisations focus a lot on the process and ignore teams and technical practices.
This leads to 1/3 agile. There are a number of reasons why the other two-thirds are difficult -- cultural challenges, and inability to drive change.
The presentation looks are three vital skills that agile scrummasters / coaches should focus on, which are they often ignore: leadership, relationship building and influencing.
More explanation of the slides is available here - http://toolsforagile.com/blog/archives/1090/one-third-agile-being-change-agent