When Raylan ejects the loaded round from a pistol, the sound of an empty shell hits the ground. Loaded ammunition does not sound like that when it hits the ground.
At 31:12, from viewed from behind Raylan, his jaw doesn't move while he is speaking to Gary.
Wynn tells Gary to meet him on I-75 southbound at "the big rest stop just past High Bridge Creek." However, the only rest stop on I-75 proximate to Harlan is the Welcome to Kentucky center at the Tennessee line, about 45 miles west-southwest of Harlan.
Around 24minutes, while the crew is sitting in the living room, watching an old western, three US Marshalls didn't think to close the blinds, so the people they are guarding....which includes one of the Marshalls....can't be observed/shot through the windows.