At the road side stands, the flag of Texas has the white star upside down. The stripes are correct so the flag, itself, is not upside down.
A microphone is visible twice: once at the bottom of the screen about 42 minutes into the film; the other at the top of the screen about 10 minutes before the end.
Boom mic is visible above Cowboy Dashee's head when they encounter the dead body at 13 minutes.