"Amusement Parks U.S.A."

Last night, I learned the bass part for "Amusement Parks U.S.A." and noticed a small feature in the song.  Underneath "day" in the last "Let's take your car and mess around at the park all day" (at ~2:13), the bass (and I think also the guitar) has a chromatic phrase from F down to B.  Musically, this gives a sense of entirety for that "all day."