This is the second episode in which Usagi hits Mamoru on the head with her shoe.
The phrase quoted by Jadeite, "The life of a flower is short and full of suffering," was also used by Sailor Moon in Sailor Moon R: The Movie: The Promise of the Rose (1993) and in the episode A Mystic Flower That Steals Hearts! The Third Witch, Telulu (1995) of the anime.