The foreshadowing for this moment is more clear in the manga, Notice where Grisha is looking : r/ShingekiNoKyojin

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Tropes A to F / Attack On Titan - TV Tropes

List of All Foreshadowings for the Basement Reveal (Update - 3/3) - Forums

Zeke Jaeger, Ank Wiki

Holy shit, this is the mother of all foreshadowing : r/ShingekiNoKyojin

New Chapter Spoilers] This underrated moment made my heart melt : r/ ShingekiNoKyojin

All Foreshadowing and Easter Eggs in Attack on Titan: Season 1 - Abhirup's website

Mikasa the Butterfly Goddess Theory – Lost Girls OVA Review – In Asian Spaces

Zeke Jaeger (Anime), Attack on Titan Wiki

Shingeki no Kyojin Season 3 Part 2 Episode 8 Discussion (100 - ) - Forums