Go to the special features menu. Navigate up and highlight the 
word "Special" in Special Features then press enter. This will 
give you a short interview with David Lynch explaining how well 
he likes McDonalds. 

Go to the scene selections menu. There will be frames of the 
scenes that you can choose to jump to. While navigating through 
these frames, an ear will appear between the 3rd (A Gruesome 
Discovery) and 4th (Curious Conversation) frames. Press enter 
on the ear and Kyle MacLachlan will give you an explanation 
of the "chicken walk" scene on the sidewalk.