When Frank is shaving he has shaving cream on his left ear. He stands up at the mirror and leans down to talk and it's no longer on his ear and the shaving cream is much thinner on his face.
The checkerboard Hawk & Trap are using is in the wrong position. Each player should have a white square to his lower right. Theirs are black.
The patient Frank wants to send back to active duty has a lower extremity fracture requiring both cast and traction. At a stage of healing where the cast would be removed the next day would be several weeks post-injury. It's highly unlikely that he would still be at a MASH unit.