Dud Wash is mentioned as a Private First Class, but when he gets off the bus, his sleeve insignia is that of a Private.
As the Darlings begin to fill the radiator, Andy walks up from behind the truck and a mic cord can be seen coming out of the bottom of his left pant leg.
When Andy catches the Darlings leaving their single-occupant hotel room, they leave their instruments behind. There were no instruments left behind the first time they snuck out, and Brisco couldn't have helped as he was busy playing his jug.