WHY do people compare it 'MASH'?
True enough, both movies follow the "adventures" of two buddies (one of whom is played by Elliot Gould) in a unique little microcosm, there's lots of overlapping dialogue, etc. The movies do share some similarities, but I seriously don't understand how people compare 'California Split' to 'MASH.' Most reviews you read out there, including Roger Ebert's, call it a not only a better film than 'MASH' (a matter of opinion that I can't really take issue with), but also a funnier movie.
'MASH' is a full-on comedy. 'California Split' is much more of a "Let's follow these characters around and see what happens" kind of movie; there was humor in the film, to be sure, but I only laughed out loud three or four times. I just didn't think of it as a comedy at all.
Funnier than 'MASH'? NO FRIGGIN' WAY. But the movies are so different from one another, that I don't see how the comparison would be valid in the first place.