The first thing i really noticed with Mash was that it did not hold back, religion was mocked and Mash really didn’t hold back, this is very pertinent in one scene, the legendary Last Supper scene, followed by Painless rising from the dead, only after a nurse has sex with him. This scene also shows the use of satire as sex, and honoring the “Faux Dead” with the use of sex and booze, again just breaking all the boundaries that the youth of that time were all about.
The overlapping dialogue was a technique used to add a dose of realism to mash, just because someone else is talking does not mean some one else isn’t going to talk over them, this adds a real dose of realism to the movie, as well as adding an element of chaos, which is a major aspect to the war, and surgery tents. Its like the films protagonists relished in breaking the rules, and that is shown through the technical aspects of Mash