At the 'Main' menu go to 'Special Features' and scroll through until there is a billboard in the background. Highlight it and using your remote control press the 'Enter' key and you will be able to view an interview with Steve Martin talking about his inspiration to use the billboard to give the main character 'signs'. There are also interviews with the cast which are in 'Biographies' and are accessed by selecting the symbols like the musical note when they appear.