Watching this episode, the viewer might feel the need to remind themselves that this is indeed a sitcom. The writers pack more emotion into this half hour than can be found in most serious TV dramas.
Following a surreal recap of Part One from Coach, we have a brief check in at the bar (Hungry Heifer: still lousy) and then cut to Philip Semenko painting Diane's portrait. Semenko has the hots for Diane, but she says she still loves Sam. While Semenko is unsuccessful at bedding Diane, he does manage to get her to confront her true feelings about Sam. Diane's monologue is deeply moving and one of the character's moments of true self awareness.
There are some truly funny parts, and the biggest laugh comes from Sam's attempt to reconcile with Diane with a black velvet portrait (CARLA: even I think that's tacky!). We then cut to Semenko's modernist painting of Diane. From then on the rest of the episode is a showdown between our two lovers.
The breakup is both funny and ugly. At one point it turns physical - the violence is shocking but quickly devolves into Three Stooges slapstick. Diane leaves, emotionally and physically wounded, and an equally bruised Sam unwraps the package and sees the painting. Fade to black. See you next season?