1- Letting the founders bypass him -- and talking about it;
2- Not anticipating that Steve Jobs would be furious about Android;
3- Asking Google's search team to bury info about a political donation;
4- Failing to close the Groupon buy;
5- Not buying Twitter when it was still cheap;
6- Underestimating Facebook;
7- Striking out in social;
8- Not earning the trust of content owners;
9- Investing in AOL.
It's debatable but it sheds some light into the difficulties of nurturing a company like Google.