My mother got me into MASH originally. I bought her the collectors edition series set (I'm sure this is the same one you own as well) and have watched the entire series with her several times over. Pretty much anytime I go over to her house, we'll put it on for background noise when we're bullshitting. I was a big fan of Winchester, but Frank provided so much comic relief. And as for the potty humor, it's in pretty much everything. Golden Girls was pretty bad about it, but no blatant cursing, nor any vulger sex jokes... But they had their moments.
Big Band is classic whit. I love the intellectual humor that goes along with the idea of the show. I also give kudos to the creators for expanding so many peoples vocabulary... I never thought "coitus" would be a commonly used word. I am also a fan of the title names (as wierd as that sounds) because they are smart with context geared toward the episode.
I will have to find Castle to watch it. Is it still going or is it an older series I can find on Netflix?