Both episodes emphasize the recurring theme of and Eren's evolving agency , where "Episode 20" serves as a benchmark for massive plot revelations in each respective half of the series.

: In a shocking twist, it’s revealed that Grisha originally hesitated to kill the Reiss family. However, the future Eren (standing in the Paths) spoke to his father through memories, manipulating Grisha into committing the massacre to ensure the current timeline exists.

: After a grueling chase through the Forest of Giant Trees, the Female Titan is successfully lured into a trap using a barrage of iron restraints.

: This revelation reframes Eren from a victim of fate to the ultimate architect of the series' events, turning the entire plot into a causal loop.

: Eren struggles with his decision to trust Levi’s squad instead of transforming himself. Commander Erwin Smith reveals that to change anything, one must be prepared to sacrifice their humanity—justifying the high casualty count of the mission.

Considered one of the most significant episodes in the entire series, it fundamentally changes how the audience views the story.

: Eren and Zeke travel through the memories of their father, Grisha Yeager . It is revealed that the Attack Titan has the unique ability to see the memories of its future holders.

This episode is a masterclass in tension and tactical secrecy during the 57th Expedition Outside the Walls.