- One of the most significant ones occurs when Percy has a disturbing vision of his mother falling through the ceiling, back when he was a child. This flashback offers insight into Percy's troubled past and familial circumstances.
- Another flashback happens when Luke reveals his true colors and recounts how Percy's father stole the secret lightning bolt of Zeus. Luke shares stories of his difficult upbringing and his growing resentment toward the gods, shedding light on his motivations and grievances.
- There's also a brief flashback when Chiron discusses the prophecy surrounding Percy and the other demigods.