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Lex tells Clark and Lana: "Do you know what people remember about the greatest star-crossed romances? Not how the lovers met, but the way the relationship tragically ended...." One other example would be William Shakespeare's Romeo and Juliet, which ends with the lovers committing suicide.
Winslow Schott is Smallville's version of comics villain "The Toyman."
In the episode Winslow Schott is seen talking to a dummy and using a monkey that claps, this is the Toyman's iconic items he's used in not only CW's Supergirl "Childish Things", but also in the Batman The Animated Series, Superman The Animated Series, and The Batman.
Lex Luthor is not portrayed by Michael Rosenbaum in this episode.
In one of the last scenes Oliver is seen holding Lex's kryptonite ring. Lex first wore this ring in Season Four's "Onyx".
Clear kryptonite makes its sixth and final appearance of the series in this episode. The other episodes being Visage, Hereafter, Trespass, Bizarro and Instinct.