This is the first and only time in season seven to feature appearances from all eight main characters.
This flashback takes place in a Swann residence, as evinced by the armorial shield bearing three swans seen when young Patricia comes down the stairs.
In the flashback, Lex can be seen playing with a Warrior Angel action figure which has a strange resemblance to Superman.
Lionel Luthor refers to Lois and Jimmy (when they sneak into his office) as the 'dynamic duo'. This term usually references Batman and Robin from DC Comics. On the show Batman the Animated Series, John Glover voiced the Riddler. He also had a small role in Batman and Robin (1997).
Kara tries to help Clark fly and says "Up, Up, and Away!"... a phrase generally associated with the Superman character in DC Comics.