Not Quite Right
As a historical show dealing with a serious subject matter, M*A*S*H was designed to be as close to reality as possible in many ways. However, like with so many TV shows and movies, there were some inaccuracies spotted by eagle-eyed fans over the years.
For example, the style of boots worn by the cast wouldn’t have actually been used. The presence of items like a pinball machine and candy bars with UPC codes were anachronistic, too.