On the Special Features page, move up or left to highlight David's glasses. This will play a 3 1/2 minute clip of David doing an extended "Ricky Henderson" bit.
Every page of the DVD has a short audio clip that plays after 10 or 12 seconds.
The Special Features page audio plays longer, until the phone messages are deleted.
Every page of the Chapter Selection has a different audio clip.
On the last page of the Chapter Selection, move left from the top of the list to highlight the left eye of David's glasses. This will play a 6 minute clip with an early clip of David onstage and some run ronnie run behind-the-scenes footage.