Here is a video of a speech made by Guy Kawasaki at UC Berkeley discussing mistakes made by entrepreneurs. Below is the youtube video description:

The UC Berkeley Startup Competition (Bplan) proudly welcomed Guy Kawasaki to the Haas School of Business. Kawasaki, former chief evangelist of Apple and co-founder of Garage Technology Ventures, explained the top ten mistakes that entrepreneurs make. His talk covered all stages of a startup from inception to exit

You can watch the video below: