The remix of A Shot In The Arm makes more use of the acoustic guitar in the mix, and is considerably less polished than the album version. The ELT (King Size Demo) is a much more stripped down straight-ahead rocker than its previous incarnation. (and of course a much less polished sounding version of the original).
The real gem however is the Daniel Johnston cover of True Love Will Find You In The End. It's almost too bad they didn't find a place for this on Summerteeth. This song shows Wilco at they're best, stripped down and heart on they're sleeve.