It's not entirely on topic, but the link below lists a lot of the continuity errors in M*A*S*H, and they're worse than almost anything in Trek. Some are downright sloppy. My point? Over the years, comparatively, the Trek folks have done a pretty good job being as consistent as they've been across several TV shows and all the movies.
Of course, M*A*S*H remains one of the most highly regarded, intelligent, ground-breaking, and well-written TV shows of all time. So, I hope clicking on the link and reading the list doesn't negate everything else and all of a sudden ruin the show for any fans.