The Darlene/Jackie feud, that has been going on for a few episodes, came to a head. After Darlene called her a loser, Jackie slapped her!
Harris, in a rare moment of showing that she cared, said "Don't hit my mother!" and almost charged Jackie (Dan stopped her).
And why is Harris's friends name Odessa? Why name your kid after an organization that helped Nazis flee justice after WWII?