Well, first it's not a guitar, it's a bass. And if you look at the tuning pegs of the bass, there are 7. A bass has 4 strings. And just wondering, what "ad thing"?

If you are talking about the thingin the top left that says "The Mark, Tom, and Travis Show", he didn't make that himself. If you look at the CD cover itself, you notice how the same elements are there.

http://www.volny.cz/vin_diesel/blink51.jpg