When Charles is tied up and ranting to Col Potter about Hawkeye and BJ he says that he "wants these vermin hung." A blue-blooded, Harvard educated doctor would know that the proper word is "hanged", not "hung".
At the end of the bar fight someone gets pushed through a glass window with a large crash of glass. Klinger then delivers a last line in front of the now broken window. The translucent "glass" is clearly a plastic sheet which can be seen hanging and moving behind him. The same window is visible in the background of the last scene of the show.