During the third chorus the line changes from "the sound of a whippoorwill on a country road" to "the sound of a shovelhead on a gravel road" In the official Sony video Alan's guitar appears to be capoed on the fourth but I'm not sure he's really playing as much as just holding it. I like the sound better on the 2. Call it a good job!!
OBTW for me the line would be "the sound of as Continental 020 idleing low" -flying2bill | 9/7/2009