When Dorothy snaps at Oliver, she mentions him "throwing up in the pool" at a new year's party at Blanche's house. There is no pool on the girls' property (which is Blanche's house, and they've always all lived there); it is never seen or mentioned outside of this episode.
Sophia mentions the wife of St. Francis of Assisi. St. Francis was a Franciscan friar and unmarried.
Blanche says that she has never been rejected, except jokingly by Weight Watchers. In 'The One That Got Away' (4:3), though, she takes a second shot at a man who rejected her when they were younger.