As I recall from seeing "The April Fools" back in the late '60s-early '70s, this film is worth seeing just for a brilliant performance by Sally Kellerman in the role of Howard Brubaker's long-suffering, and forever home-decorating wife, who springs to life fully-formed three decades before the first house renovation and make-over TV series ever aired. It's true that there's a lot of stylish fun in this film, but there's also a sense of regret and a longing for something that never quite worked out the way it should have for the Jack Lemmon character that gives "The April Fools" some real poignancy. But then, I've never found melancholy to be a particularly bad thing. The script is first rate, as are the cinematography, set-decoration and musical score by Burt Bacharach. If you can locate a copy of this gem, I highly recommend it.
Review of The April Fools
