About three quarters of the way through the book, I went to my fantastic local, indie video store (shout out to Video Isle and Alex, who makes movie magic happen!) and rented the movie. Yowzah. It was a very different story, but I thought the atmosphere and questions raised were in keeping with the spirit of the book. How does one take a very internal novel and make an Oscar-winning movie from it? Yup, you may need to add some big drama, change who's had affairs and why, substitute two adorable dogs for a garage-ful or animals, and attach geniuses like Colin Firth and Julianne Moore to the project. I have to say THANK YOU TOM FORD-- the changes added even more to my thoughts about the novel, and we had that much more to talk about! We discussed for two hours and could have kept going.
I highly recommend A Single Man for book clubs. If you can make everyone watch the movie, do that, too.