Obscured in the auto body garage that everybody holds up in is a 1981-1983 DeLorean, which is the same car used as the time machine in Back to the Future (1985). It is very briefly seen from the side when Tracy goes to hide by it, and is out of focus in the background as Victor and Daniel talk. It's as if the filmmakers were trying to hide the vehicle.
The song playing in the final scene is "Mama Tried" by Merle Haggard.