Here possible related text on physical journeys : http://www.youtube.com/watch?v=1SNv3o_yhkk
Some Points you could mention are:
-The central goal of the journey in this text is to relinquish their thirst for hunger
- The road is seen to be the medium in which the 2 protagonists travel on, presenting the continous nature of their physical journey
- Hyperbole of "looking in your underwear" further reinforces their designated path of fulfilling this physical journey
- The use of a metaphor to convey that life is a journey itself, where their life after school is to go find some "good food"
- The encompassing and inappropriate use of clothing provides the message of diversity in the search and quest for "good food"
As you can see, these points discuss how both the lyrics and the music video can capture the essence of the physical journey.