I did not see the original stage play. What I saw, a few years before I managed to catch up with this movie, was telecast on HBO: Barefoot In The Park, starring Richard Thomas and Bess Armstrong. That version was a riot! This one, while having a few outdoor scenes, lost its luster. Both Fonda & Redford seem flat... certainly not up to the energy of Thomas & Armstrong. I haven't found the HBO version in the IMDb, but hopefully somebody with the particulars of the film will be kind enough to add it. I rated this Fonda-Redford version a 7.