During the trial scene, Winchester's uniform shows 3 brass buttons above his belt. When Hawkeye and B J show up with a picture of the guilty party, Winchester's uniform shows 2 brass, and 1 black plastic button above the belt.
Winchester mentions J. Fred Muggs, referring to the chimp mascot from the Today Show on NBC-TV. J. Fred Muggs did not join the Today Show until January 28, 1953, after Winchester was already in Korea.